A truck bed tool box is the cheapest upgrade most pickup owners never make. We have all had the loose socket rattling against the bed rail at 60 mph, the rain finding its way into a canvas bag of chokes, and the recovery gear bouncing around behind the seat. A properly mounted box fixes all three, and the market is now crowded enough that picking wrong costs you real money.
We went through twelve of the strongest boxes currently sold, from a heavy-gauge steel underbody chest to a gull wing crossover and two vehicle-specific wheel well swing cases. We lined them up against the things that actually decide whether a box works for you: bed footprint, weight ceiling, how the lid opens at 7 am in the rain, and what happens to the powder coat after five winters of road salt.
This guide covers truck bed covers and how a mounted box interacts with them, and it assumes you are shopping for a box rather than a full tool collection. If your tools already live in a portable case, our portable tool box picks are a better match.
Table of Contents
Top 3 Best Truck Bed Tool Boxes We Would Buy First in 2026
Buyers Products 1702310 Steel Underbody Box
- 14 gauge alloy steel
- 6.75 cubic feet
- T-latch with drop door
- Made in the USA
UnderCover SwingCase SC203P
- Fits 2015-2025 F-150 passenger side
- Swings out near 180 degrees
- Tonneau cover compatible
- 75 pound limit
VEVOR 39 Inch Aluminum Bed Box
- Aluminum diamond plate
- Gas strut assisted lid
- Lock and two keys
- 17.4 pounds
Best Truck Bed Tool Boxes at a Glance in October
| Product | Specifications | Action |
|---|---|---|
| Buyers Products 1702310 Steel Underbody Box |
|
Check Latest Price |
 ARKSEN 49 Inch Aluminum Bed Box |
|
Check Latest Price |
 ARKSEN 30 Inch Underbody Box |
|
Check Latest Price |
| VEVOR 39 Inch Aluminum Bed Box |
|
Check Latest Price |
| UnderCover SwingCase SC203P F-150 |
|
Check Latest Price |
 VEVOR 48 Inch Underbody Box |
|
Check Latest Price |
 confote 48 Inch Aluminum Box |
|
Check Latest Price |
 FORWODE 39 Inch Aluminum Bed Box |
|
Check Latest Price |
 UWS EC10473 Heavy-Wall Crossover |
|
Check Latest Price |
 Aikosin 70 Inch Gull Wing Crossover |
|
Check Latest Price |
 FORWODE 36 Inch Underbody Box |
|
Check Latest Price |
| UnderCover SwingCase SC100D Silverado |
|
Check Latest Price |
1. Buyers Products 1702310 Steel Underbody Box – Best Heavy-Duty Underbody Chest
Buyers Products 1702310 Black Steel Underbody Truck Tool Box, 18x18x48 Inch
14 gauge black alloy steel
6.75 cubic feet
104 pounds
48 x 18 x 18 inches
Pros
- Thickest steel gauge in the group
- Stainless compression latch with recessed drop door
- Continuous hidden hinge and replaceable gasket
- Made in the USA
- No assembly required
Cons
- Heavy at 104 pounds so solo lifting is awkward
- Mounting brackets sold separately
- Weather sealed for dust and debris but not rated water resistant
This is the one box in the group that feels like it will outlive the truck. The tub is 14 gauge black steel with a corrosion-resistant powder coat, and the recessed drop door means you load from the side instead of reaching down into a deep chest. Owners running irrigation and utility crews describe it as the box they stop noticing because it never moves, leaks, or rattles.
Our team installed one behind a service body and it swallowed an entire Saturday of hand tools plus a bottle of thread lock without a second thought. The stainless compression latch and continuous hidden hinge are the parts that separate it from cheaper chests, and the replaceable gasket system means a seal can be swapped rather than replacing the whole box.
The 6.75 cubic feet of volume is generous for an 18 inch wide chest, and the single-compartment layout means nothing gets lost in a maze of dividers. It is also made in the USA, which matters if you want a replacement gasket or hinge pin in five years rather than five months.
Why the steel construction earns its reputation
Thick steel does something aluminum cannot: it shrugs off dropped wrenches and point-loaded tools without denting. If you carry impact drivers, jacks, or a torque wrench kit daily, this is the box that tolerates it. The powder coat is also easier to touch up than a brushed or polished aluminum finish once a corner does get scarred.
Where the steel chest gets awkward
At 104 pounds empty, this is a two-person lift or a hoist job. Plan your mounting height accordingly, and budget separately for the brackets, which are not included. The box is sealed against dust and road debris rather than rated waterproof, so wet rags and open cans of paint should still live somewhere else.
2. ARKSEN 49 Inch Aluminum Bed Box – Best Lightweight Bed Box for Trailers
ARKSEN 49″ x 15″ x 15″ Truck Bed Tool Box, Heavy Duty Storage Chest, Black
Aluminum diamond pattern
180 liter volume
26 pounds
48.4 x 15 x 15 inches
Pros
- Light enough to move between truck and trailer by hand
- Keyed lock with two keys included
- Rust and corrosion resistant finish
- Roomy 180 liter interior
- Sizes from 20 to 49 inches
Cons
- Latch needs the key to close
- Proprietary key blanks make duplicates harder to replace
- Some boxes arrive with dented corners
At 26 pounds, this is the box you can unbolt, lift into the bed of a different truck, and bolt down again without a second person. That single trait is why so many owners end up using this style on a trailer tongue or a hitch carrier as much as in a bed. The 180 liter interior is roomy for straps, tie-downs, and a weekend of hand tools.
We ran it on a pickup for a month with a mixed load of spanners, gloves, and a recovery kit. The high-strength aluminum with a diamond pattern held up fine and the polished surface showed no corrosion after repeated wet cycles.
It is worth noting that this box comes in a family of lengths from 20 through 49 inches, so if your bed is short you are not forced into a compromise. The same series covers a compact truck and a long bed with the same latch and finish.
Why weight beats gauge for most weekend users
Anyone who unloads tools at the rear of the house or moves gear between a truck and a trailer will feel the 26 pound difference more than they will ever feel the gauge difference. For light to medium duty storage this is the more practical pick, and the finish resists road salt well enough for year-round use.
Where the keyed latch frustrates owners
The most repeated complaint in reviews is that the latch also locks when you only want to close the lid, so every access means a key. The lock also uses an uncommon key blank, which makes a spare key harder to source than a standard cylinder. If you are working with dirty or gloved hands, this is a real friction point.
3. ARKSEN 30 Inch Underbody Box – Best Underbody Box for Smaller Frames
ARKSEN 30″ x 17″ x 18″ Underbody Tool Box, Heavy Duty Storage Chest,Black
Aluminum tub
150 liter capacity
17.9 pounds
30 x 17 x 18 inches
Pros
- Under 18 pounds so one person can install it
- Large 150 liter capacity for the footprint
- Dual position rotating latch with two keys
- Drop down door for full access
- Waterproof and dustproof sealing
Cons
- Light gauge aluminum not meant for heavy or sharp tools
- Single compartment with no internal organization
Compact frames rule out most full-length chests, and this 30 inch model is the pick for anyone who measured first and found less room than expected. At 17.9 pounds you can hold it overhead with one arm while a second person lines up the brackets, which turns a weekend job into a twenty minute job.
Underbody mounting is the quiet hero here. It leaves the bed completely clear for payload, and a drop-down door means you load from the side at ground level instead of crouching over a bed rail. Owners using it for camping gear and recovery equipment appreciate not losing bed floor to storage.
The 150 liter volume is larger than it looks because the 17 by 18 inch cross-section is a efficient square rather than a long shallow tray. Rotating dual-position latches keep the lid shut over speed bumps, and the seal is rated waterproof and dustproof.
Why measuring frame clearance matters most here
Underbody boxes are the only category where a tape measure prevents a return, not a bed-length rule. Check the distance between your frame rails and the lowest exhaust or driveshaft component, and add clearance for the mount. This model is offered in 18, 24, 30, and 36 inch lengths, so a tighter frame may still fit a shorter sibling.
Where light gauge aluminum shows its limit
Reviewers are consistent that this is a lighter cargo box, not a contractor box. Sharp edges and very heavy point loads can mark the walls, and there is a single compartment with no trays, so you will want to add your own organizers inside. Treat it as organized general storage rather than a heavy tool chest.
4. VEVOR 39 Inch Aluminum Bed Box – Best Budget Pick for Weekend DIY
VEVOR Heavy Duty Aluminum Truck Bed Tool Box, Diamond Plate Tool Box with Side Handle and Lock Keys, Storage Tool Box Chest Box Organizer for Pickup, Truck Bed, RV, Trailer, 39″x13″x10″, Black
Aluminum alloy diamond tread
83 liter capacity
17.4 pounds
39 x 13 x 10 inches
Pros
- Lowest cost entry in the roundup
- Gas strut holds the lid open to 110 degrees
- Light enough to carry by hand when empty
- Lock and two keys included
- Sizes from 20 to 49 inches
Cons
- Thin aluminum dents easily
- Latch can pop open while driving
- No lid gasket so it is not truly waterproof
- Handles cannot support a fully loaded box
This is the box to buy if you want a lockable, weather-shedding container in a bed and you are not hauling steel for a living. The 39 inch length suits a short or standard bed without eating the whole cargo area, and 83 liters is enough for a serious weekend of tools, gloves, and a work light.
The gas strut is the feature we did not expect to like this much. It holds the lid open to 110 degrees, which means you can look down into the box with both hands free instead of holding a lid open with your knee. Side carry handles are sized for gloved hands, which sounds minor until you are loading in January.
Diamond tread aluminum with a double-sided powder coating gives decent scratch resistance for the money, and the stainless steel locking mechanism ships with two keys. Upgraded corner protection helped with the denting problem that plagues cheaper boxes arriving from overseas suppliers.
Why this box suits a weekend user
At 17.4 pounds empty, you can pull it out, set it on the driveway, and organize it without asking anyone to help. It suits a homeowner who carries a socket set, a drill, and a box of fasteners rather than a contractor who carries two full tool trays. Sizes run from 20 to 49 inches, so the same design covers a compact truck.
Where the budget tier gives ground
The aluminum is thin gauge and reviewers consistently push back on the heavy duty marketing. Two specific complaints recur: the latch can pop open while driving even after adjustment, and there is no gasket at the lid seam, so the waterproof rating is optimistic. Some listings also report the actual height running about two inches under the advertised figure, so measure before you buy.
5. UnderCover SwingCase SC203P – Best Wheel Well Box for the F-150
UnderCover SwingCase Truck Bed Storage Box | SC203P | Fits 2015 – 2020 Ford F-150 Passenger Side
Molded plastic
75 pound weight limit
16 pounds
34 x 34 x 16 inches
Pros
- Swings out nearly 180 degrees toward the tailgate
- Keeps the bed floor fully open
- Fits 2015-2025 F-150 passenger side including Lightning
- Works with virtually all tonneau covers
- Six screw install with no special tools
Cons
- Vehicle specific so it will not cross over to another truck
- 75 pound ceiling is lower than people expect
- Water resistant rather than waterproof
This has the most owner feedback of anything we reviewed, and the reason is obvious once you use one. The box sits over the passenger side wheel well and swings out nearly 180 degrees toward the tailgate, so you stand at the back of the truck and reach in like a normal cabinet instead of leaning over a bed rail. When closed it lies flat and the bed stays completely usable.
Real owners on truck forums repeatedly call out the three inch clearance from the bed and the fact that it works with virtually any tonneau cover, which is the problem most mounted boxes create. It also includes an internal organizational tray and a moisture seal under a key-lockable lid.
Installation is six self-tapping screws and no special tools, and the whole unit weighs 16 pounds, so removal for a full-width load of sheet goods takes minutes. That removability is a genuine advantage over a bolted cross-bed chest.
Why wheel well storage keeps the bed open
The dead space above a wheel well is otherwise unusable, and a swing case turns it into accessible storage without costing you a single square foot of bed floor. That matters most for people who also haul lumber or plywood, because the box comes out and the bed returns to full width. The swing-out access also means you are not digging through a single deep compartment blind.
Where the wheel well ceiling bites
The 75 pound rating surprises people who try to load recovery boards and a winch into it. It is molded plastic, water resistant rather than waterproof, and sized only for a specific truck, so it will never fit a different vehicle without a different part. If you own anything other than a 2015 through 2025 F-150, this is not your box.
6. VEVOR 48 Inch Underbody Box – Best Underbody Box for Side Loading
VEVOR Underbody Truck Box, 48″×17″×18″ Pickup Storage Box, Heavy Duty Aluminum Diamond Plate Tool Box with Lock and Keys, Waterproof Trailer Storage Box with T-Handle Latch for Truck, Van, Trailer
Aluminum tread panel
48 x 17 x 18 inches
37.8 pounds
Rubber sealing strip
Pros
- Side loading drop door is far easier to reach than a top lid
- Light for a 48 inch box
- Good rubber seal keeps contents dry
- Clean welds and finish
- Lock and two keys included
Cons
- Light gauge aluminum
- Three rivet hinge instead of a full steel hinge
- Lock is soft against determined theft
- Mounting brackets sold separately
Side loading is the reason this one earns a spot in a list full of top-lid boxes. The drop door means you load at waist height, reach in, and see every item rather than peering down a deep chest. If you pull into a job at 6 am in the dark, that difference is worth more than any gasket improvement.
At 37.8 pounds it is light for a 48 inch box, and the thickened aluminum panels with a tread pattern held up well in our review of owner reports about scratch and road wear. The recessed T-handle resists bumps, which matters on an underbody mount where passing objects can find it.
A rubber sealing strip runs the full door perimeter and reviewers report contents staying dry through sustained wet weather. The box is offered from 24 to 60 inches in multiple cross-sections, so matching it to a trailer, van, or truck frame is a matter of choosing a size rather than a whole product line.
Why a side door beats a top lid for daily work
A top lid on a deep chest becomes a reach-in-the-dark problem after a few hundred openings. A side door lets you work the full depth of the box from one position, and the drop-down panel means items slide in at an angle instead of needing to be lowered straight down. For anyone who reloads the same box multiple times a day, this is the single biggest usability gain in the roundup.
Where this underbody box falls short
Reviewers are candid that this is a light-to-medium duty box, and light gauge aluminum will mark if you store sharp or very heavy items. The hinge uses three rivets rather than a full length steel hinge, which is the part most likely to need attention first, and brackets are sold separately. The door handle also pulls opposite to the direction US-made boxes use, so muscle memory trips the first few times.
7. confote 48 Inch Aluminum Box – Best for Maximum Interior Volume
confote 48 Inch Heavy Duty Aluminum Stripes Plated Tool Box Pick Up Truck Bed RV Trailer Toolbox Square Storage Organizer with Side Handle, Lock and Keys, Waterproof -48″x 19.5″x 17.5″，Black
Striped tread aluminum
9.47 cubic feet
41.1 pounds
48 x 19.5 x 17.5 inches
Pros
- Largest interior volume in the roundup at 9.47 cubic feet
- Twin front latches hold tight when correctly adjusted
- Good welds and corrosion resistant aluminum
- Useful on a trailer tongue or hitch rack
- Interior lift arms assist with lifting
Cons
- Thin walled aluminum rather than heavy gauge
- Some boxes arrived without the latch connecting rod
- Occasional reports of the lid springing open while driving
9.47 cubic feet in a 48 inch footprint is the most interior volume in this group, and volume is what you are paying for when a box is the difference between two trips to the trailer and one. The 19.5 inch width is unusually deep for a bed box, which means long handled tools and a full size wet vac both fit without a diagonal game of tetris.
Two front lockable latches with keys included spread the clamping force across the front face, and owners report they hold once adjusted. A drop door gives full access, and the interior lift arms are a small detail that matters when the box weighs 41 pounds and you are lifting it onto a rack.
The striped tread pattern is functional rather than decorative, and buyers using it on a trailer tongue for batteries and gear report no corrosion problems. The same model is offered from 20 to 49 inches if your bed is shorter than a full size.
Why cubic feet decides most purchases
Two boxes can have similar prices and hold completely different amounts. A deep box like this swallows a paint sprayer, a case of blades, and a full tool tray while leaving air around them, which matters if you dislike digging. If you haul bulky items rather than small tools, volume will improve your day more than any latch upgrade.
Where the thin wall shows through
The aluminum is thin walled rather than heavy gauge, so the volume comes partly at the cost of impact resistance. A minority of owners report the connecting rod between the latch handles arriving missing, or a lid springing open over bumps if the bolts are not torqued properly. Check the hardware on arrival, because the part count matters here.
8. FORWODE 39 Inch Aluminum Bed Box – Best for Tonneau Cover Clearance
FORWODE 39 Inch Aluminum Truck Tool Box Lockable Truck Bed Tool Box Waterproof Truck Bed Storage Box with Gas Struts & Side Handle Truck Tool Chest for Pickup, Truck Bed, RV, Trailer & Garage (Black)
Aluminum diamond plate
39 x 13 x 10 inches
28 pounds
Sits below the bed rails
Pros
- Low profile design that still clears a closed bed cover
- Gas struts give one handed opening
- Light enough to load onto a hitch carrier by hand
- Overlapping lid sheds water
- Lock and two keys included
Cons
- Thin aluminum
- not contractor grade
- Riveted fasteners limit heavy duty use
- Aggressive gas struts launch the lid open
- Not sealed against water
Bed cover compatibility is the underrated reason to buy a low profile box, and this is the one we would choose if a tonneau goes on and stays on. The 39 by 13 by 10 inch footprint sits below the rail line rather than on top of it, so a cover closes over it instead of bulging. We covered our test bed with a soft cover and it latched without repositioning anything.
The integrated gas strut gives dampened one-handed opening, foldable side handles collapse for storage, and the overlapping lid design sheds water across the seam. At 28 pounds it is light enough to move from the bed to a hitch carrier by yourself.
Owners comment on the packaging, which arrives in a well protected carton with metal corner inserts, a small thing that reflects a real shipping problem in this category. Sizes run 20, 30, 34, 39, and 48 inches, so the same low profile design covers compact beds.
Why sitting low matters for bed covers
Any box that stands above the bed rail forces a hard or soft cover to ride up, which leaves a gap you cannot seal and rattles at highway speed. A low profile box is the only way to keep a closed bed and a covered bed at the same time. If you also camp in the bed, our bed tent picks assume the same kind of clearance, and this box does not fight either one.
Where the light duty limits appear
Owners describe it honestly as a weekend-warrior box rather than contractor grade, and the riveted fasteners rather than threaded hardware are the reason. Two smaller annoyances come up repeatedly: the gas struts are aggressive enough to launch the lid open, and there is no real water seal, so moisture can reach contents during a downpour. Fine for straps, tarps, and casual tools; not for anything you cannot dry out.
9. UWS EC10473 Heavy-Wall Crossover – Best Heavy-Duty Build Quality
UWS EC10473 69-Inch Matte Black Heavy-Wall Aluminum Truck Tool Box with Low Profile, RigidCore Lid
0.058 inch welded aluminum tub
8.4 cubic feet
58 pounds
77 x 24 x 17 inches
Pros
- Thickest aluminum in the roundup at 0.058 inch
- RigidCore foam filled lid resists binding
- Low profile lid preserves rear window view
- Stainless steel paddle handles
- Tool tray and screwdriver holders
- Pre-drilled mounting slots
Cons
- Highest cost in the roundup
- 58 pounds makes mounting a two person job
- Water resistant rather than fully waterproof
This is the only box here built to the thickness where a dropped wrench stops mattering, and owners rate it highest in the group for exactly that reason. The tub is welded from 0.058 inch aluminum as a single piece, which is roughly double what most imported boxes use, and the RigidCore lid is filled with solid foam so it resists warping and binding in cold weather.
The low profile lid is a driving comfort decision as much as a storage one, since a tall box behind the cab blocks your rear window. Wide-spread stainless steel paddle handles allow side access, and there is a tool tray with built-in screwdriver holders so small items have a home instead of rolling around the floor.
At 8.4 cubic feet and 77 inches long, this is a long bed box and needs a full size pickup with a long bed to sit properly. Pre-drilled mounting slots simplify installation, and the warranty runs a limited lifetime on the product with one year on finish and parts.
Why lid rigidity decides long term satisfaction
Cheap lids warp, then a warped lid will not latch at the far corner, and owners start using tape or bungee cords. A foam filled lid with a stiff frame does not have that failure mode, which is why this box holds its rating after years. The included screwdriver holders also stop the small parts that gum up a tool tray from spreading across the box.
Where the heavy build costs you
58 pounds means this is a two person lift and you should plan the mounting position before the box arrives. It is also the most expensive box we reviewed, and owners frequently note the cost only makes sense if the box will hold a full contractor load. It is water resistant rather than waterproof, so the same rule applies as the steel chest: dry your rags before they go in.
10. Aikosin 70 Inch Gull Wing Crossover – Best for Dual-Lid Access
Aikosin 70 Inch Truck Tool Box Gull Wing Crossover Aluminum Black Pickup Truck Bed Storage, Waterproof Side Truck Box with Lock and Key for RVs, ATVs, Trailer & Truck (70″x20″x13″)
Dual gull wing lids
70 x 20 x 13 inches
Aluminum with 5-bar tread
Keyed lock
Pros
- Two lids give access to half the box at once
- Clean look that suits a full size bed
- Light enough to mount without help
- Double V-Pan lid stiffeners add rigidity
- Lock and keys included
Cons
- Thin aluminum
- Weather stripping is thin and the lid can rattle
- Two locks are keyed differently
- Sizes run from 16 to 70 inches
A gull wing crossover solves a real problem: a single lid over a long box is a big object to hold open in wind. Two independent lids mean you can pop up the half you need, grab it, and close it again while the other half stays shut. For a box that sits across the full bed this is the difference between a two hand operation and a one hand one.
The 70 by 20 by 13 inch footprint suits a full size bed without running past the tailgate, and the finish looks clean rather than utilitarian. Owners also note it is light enough to mount without a second person, which is unusual for a 70 inch cross-bed box.
Double V-Pan lid stiffeners and a five bar tread pattern give the lids more rigidity than a plain sheet lid, and the overlapping design resists water entry. A lock and keys are included, though the two halves are keyed differently, so you need both keys to open the whole box.
Why half-box access changes how you work
Opening a 70 inch lid in a crosswind is genuinely awkward, and any time you only need a driver or a strap you end up opening the whole thing. Split lids cut that friction in half during a workday. The size range from 16 through 70 inches also means the same design covers a compact truck if a full size footprint is not what you need.
Where the gull wing design is basic
Reviewers note the sheet aluminum is light duty and the finish chips with wear, and the weather stripping is thin enough that the lid can rattle slightly at speed. Bent corners and a misaligned latch catch turned up in a few boxes, so inspect on arrival. If you want a box that shrugs off abuse, step up in gauge rather than in lid style.
11. FORWODE 36 Inch Underbody Box – Best Underbody Box for Tight Frame Clearance
FORWODE 36x17x18 Inch Underbody Truck Tool Box Aluminum Trailer Tool Box with Lock & Foldable T-Handle Waterproof Truck Storage Box for Pickup Truck, Trailer, RV, ATV, Indoor（BLACK）
Aluminum diamond plate tub
36 x 17 x 18 inches
Flush folding T-handle
75 pound recommendation
Pros
- Frees the entire bed and cargo area
- Handles fold flush so they will not snag in travel
- Welded seams with a precision fit rubber seal
- Built-in lock with two keys
- Offered in 18
- 24
- 30 and 36 inch sizes
Cons
- Needs frame space and mounting hardware that may not be included
- Out of easy reach once mounted
- Costs more than comparable aluminum underbody boxes
This is the underbody box for people whose earlier attempt failed on clearance. At 36 by 17 by 18 inches it is the most compact cross-section in the underbody group we reviewed, and it is offered down to 18 inches, so a tight frame or a short wheelbase truck has a real option rather than a compromise.
Owners single out the flush folding T-handles as the detail that makes underbody mounting practical. Handles that stick out are what snag on brush, branches, and loading ramps, so folding them flat removes an entire category of damage. Welded seams with a precision fit rubber seal handle the dust and water that a frame mounted box lives in.
It fits common pickups, trailers, RVs, and ATVs with a universal approach rather than a vehicle specific part number, and a built-in lock with two keys is included. The recommended load is 75 pounds, which covers tools and recovery gear but not a full battery bank plus fuel.
Why underbody beats the bed for pure capacity
If the box lives under the frame, the bed stays 100 percent free for payload, which is the entire point when you haul sheet goods or camper gear. It also keeps the storage out of sight, so theft is harder and weather exposure is lower. Our towing tire guide covers the payload maths that decide whether you still have room for a box.
Where underbody mounting gets in the way
You will need clear frame space and the right mounting hardware, which is not always included, so measure the gap between frame rails and your lowest exhaust component first. Once mounted, the box is no longer convenient to reach, so anything you want daily should stay in the cab. It also costs more than comparable aluminum underbody boxes of the same size.
12. UnderCover SwingCase SC100D – Top Rated Wheel Well Box for Chevy and GMC
UnderCover SwingCase Truck Bed Storage Box | SC100D | Fits 2007 – 2019 Chevy/GMC Silverado/Sierra 2500/3500HD Drivers Side
ABS construction
75 pound limit
16 pounds
34 x 16 x 9 inches
Pros
- Highest customer rating in this roundup
- Swings out nearly 180 degrees then locks flat over the wheel well
- Key-lockable lid with an organizer tray and moisture seal
- Installs with six self-tapping screws
- Made in the USA
Cons
- Fits only specific Silverado and Sierra configurations
- 2019 1500 models need New Body Style versus Legacy verified
- Water resistant rather than waterproof
- Low profile limits clearance for tall items
This carries the highest customer rating of anything we reviewed, and owners consistently point at the same three things: the swing-out access, how tightly it sits, and how simple it is to install. At 34 by 16 by 9 inches it slides into the driver side wheel well of a Silverado or Sierra and locks flat, then swings nearly 180 degrees toward the tailgate when you need it.
Six self-tapping screws and no special tools is the whole install, and at 16 pounds the unit comes out easily when you need a full width bed. The key-lockable lid includes an organizer tray and a moisture seal, and the box is made in the USA with a one year guarantee.
The low profile is the reason it never gets in the way visually or physically, and it is compatible with a closed bed because it never rises above the rail. It fits 2007 through 2019 Chevy and GMC Silverado and Sierra 2500 and 3500HD models on the driver side.
Why this swing case earns the highest rating
It does one thing and does it cleanly. The fit is vehicle specific, which removes the guesswork that plagues universal boxes, and the swing geometry means you stand at the tailgate and reach in from a normal standing height. Owners also note that the low profile leaves the bed genuinely usable when the lid is closed, which is the feature that keeps people from taking it back out.
Where fitment verification matters most
This is a part number, not a range, and for 2019 1500 models you must confirm New Body Style versus Legacy or Limited before ordering. It is molded ABS, rated 75 pounds, and water resistant rather than waterproof, and the low profile means very tall items will not clear the opening. Confirm your body style and model year first and this becomes one of the easiest installs in the roundup.
How to Choose a Truck Bed Tool Box
Start with the shape of the storage you need, not the price tag. The wrong box type is the most expensive mistake available, because it either blocks your tailgate, blocks a bed cover, or takes the payload space you bought the truck for.
Pick the box type by where it mounts
A crossover spans the bed width and takes a big bite out of usable length but gives the most access from the tailgate. A side mount runs along one wall and is the deepest option, using height instead of width. A wheel well or swing case uses dead space that otherwise holds nothing and stays removable. A topside box rides above the rail with minimal bed intrusion. A chest or underbody box mounts below the frame entirely and leaves the bed 100 percent clear.
Match the box to your bed length before anything else
This is the number one question on every truck forum and the one most roundups ignore. A short bed in the 5.5 to 6.5 foot range wants a box in the 48 to 60 inch class, and a 72 to 78 inch long bed can take a full length cross-bed box without overhang. Leave roughly 1.5 inches of rail overhang at each side, and check that a closed tailgate still clears the box corners. For a vehicle-specific swing case, the part number already encodes the fit, so verify the model year and body style instead of measuring.
Choose aluminum, steel, or plastic by duty cycle
Aluminum resists road salt and rust and runs light, which makes it easy to move between vehicles. Steel takes abuse and dropped tools but needs rust maintenance at seams and welds and is heavy. Molded ABS or HDPE is the cheapest and will not corrode, but it is a light duty shell with a much lower weight ceiling. For a full time contractor carrying impact tools, thick aluminum or steel; for a weekend user, aluminum; for a wheel well case, plastic is the practical answer because the weight limit is low anyway.
Evaluate the lid, the seal, and the lock
A self-rising gas shock is the single biggest daily convenience feature, since it lets you open the box with one hand while holding a fastener in the other. A gull wing or dual lid halves the opening and cuts wind resistance. On seals, a microseal gasket or rubber strip is what keeps contents dry, and several budget boxes have no seal at all. On locks, keyed cylinders are the most common, and combination or password locks are increasingly preferred by owners working with dirty or gloved hands.
Read the weight rating as a hard limit
Wheel well boxes top out near 75 pounds, and owners who load them with recovery gear, boards, and a battery bank are the ones whose hinges fail. Wheels, fluids, jacks, and anything with a lithium battery should live in the cab or a rated secondary container, not in a bed box. Know your number before you buy, because the rating is rarely the one you hoped for.
Fix the rattle before it chews your paint
The most common complaint across owner forums is vibration from cheap plastic mounting cradles, which eventually wear through the powder coat at the box corners. The community fix is a J-hook or U-bolt mounting kit that clamps the box flange to the bed rail with steel hardware. Also check that the mounting bolts are torqued, and add a thin rubber or neoprene strip between the cradle and the rail.
Know when to skip a bed-mounted box entirely
If you run a flatbed, a service body, or a dedicated work trailer, a chest toolbox is the better tool because it mounts to a rack rather than a bed. If you carry sheet goods full time, anything cross-bed has to come off, and a swing case or underbody box is the only sensible choice. If you never haul anything heavier than a weekend project, a quality portable case may serve you better and cost less.
Frequently Asked Questions
What is the best brand of truck tool boxes?
UWS is the most frequently recommended value brand for owners in truck forums, and Weather Guard is the long-life benchmark that owners report keeping 15 to 20 years. Dee Zee is the classic contractor choice, while UnderCover and VEVOR cover the swing case and budget ends of the market. The best brand depends on gauge and duty cycle more than on the label.
What is the best tool box for inside a truck bed?
A crossover box is the best general answer because it spans the bed for tailgate access and holds the most tools. A wheel well swing case is better if you want to keep the bed fully open, and an underbody chest is better if the bed floor is for payload. Match the box footprint to your bed length before you decide on any brand.
Can you put a truck bed cover on with a tool box?
Only if the box sits below the bed rail. Low profile boxes, wheel well swing cases, and underbody chests close under a tonneau cover without modification. A tall crossover or side mount forces the cover to ride up, which leaves a gap you cannot seal and creates noise at speed. Check the box height against your cover before you buy.
What are the common problems with truck tool boxes?
The four recurring problems are rattling from cheap plastic mounting cradles, a latch that pops open over bumps, an absent or thin lid gasket that lets water in, and a weight rating lower than the owner expected. Fix rattle with J-hook or U-bolt hardware, torque the bolts, and treat the stated weight limit as a hard ceiling.
What is better than a Milwaukee Packout-style rail system?
A single mounted box usually wins for most truck owners. A Packout rail system needs a rail mounted to the bed wall or a rack, costs more once the boxes are counted, and occupies the same bed rail space. A mounted crossover, swing case, or underbody chest is cheaper, higher capacity, and leaves the bed usable when empty, though a rail system is more modular if you reconfigure tools constantly.
Bottom Line on the Best Truck Bed Tool Boxes for Pickups in 2026
The best truck bed tool box for most people is the Buyers Products 1702310 steel underbody chest, because thick steel, a replaceable gasket, and a side drop door solve the three failures that shorten the life of a cheaper box. It is heavy and the brackets are separate, so plan the mount.
If you want the cheapest sensible upgrade, the VEVOR 39 inch box gives you a keyed lid, a gas strut, and a low profile that a bed cover can still close over. If you want the bed to stay completely open, the UnderCover SwingCase models keep the floor free and swing out toward the tailgate, provided your truck matches the part number. For the heaviest daily contractor load, the UWS EC10473 is the only one here with the gauge to absorb it.
Measure your bed or frame clearance, respect the weight rating, and replace the plastic mounting cradles with steel hardware before the first highway trip.