This UWS wheel well tool box turns the dead space above the passenger-side wheel arch into 3.9ft³ of locked storage, plus three sliding drawers behind their own lockable door. It is cut to sit over and around the fender rather than eating into the bed floor. The tub is a single piece of 0.058" aluminum, the lid is UWS's patented RigidCore foam-filled design so it will not flex or bind, and a MicroSeal gasket runs the full perimeter of the opening to keep rain and dust out. The finish is bright aluminum diamond plate. This is the heavy-packaging version of the box: mechanically identical to the standard part, but crated for parcel carriage so it can ship without freight. UWS designs, fabricates and welds it in Florida and backs it with a limited lifetime warranty.
What's Included:
UWS 48" Wheel Well Tool Box in Bright Aluminum, passenger-side box (sold singly, not as a pair), part EC30021
2 keys
Three sliding drawers behind their own lockable door
NOT included: mounting hardware. UWS states you must supply your own bolts to suit your truck
UWS installation sheet, product literature and warranty information
Features
Extra-Thick 0.058" One-Piece Aluminum Tub The tub is formed from a single piece of 0.058" aluminum rather than welded up from thinner panels, so there are fewer seams to leak or split and the box keeps its shape when it is loaded with heavy hand tools, cordless kits and chain. Aluminum also means it will not rust out from the inside the way a painted steel box does once the coating is chipped, which matters on a box that lives outdoors and gets road salt thrown at it every winter.
Opens From the Side of the Truck The lid opens outward from the side of the bed, so you can reach the contents standing on the ground beside the truck instead of climbing up over the rail.
Limited Lifetime Warranty UWS backs the box with a limited lifetime warranty, with one year on the finish and one year on parts. That is the manufacturer telling you what it expects the welded aluminum structure to do over the life of the truck.
Zinc-Plated Steel Slides The slides are zinc-plated steel rather than bare, so they resist the corrosion that would otherwise seize a drawer mechanism mounted this close to the road.
Self-Opening Lid Release the T-handle and the lid lifts and stays up on its own, close to a full 90 degrees. That is a genuinely useful detail when both hands are full or you are working in the dark: you are not holding a heavy lid open with a shoulder while you dig for a socket.
Three Rear-Opening Sliding Drawers Three drawers slide out toward the tailgate, which is where you are standing when you need them. On this box they sit behind their own small lockable door at the rear, so a set of drill bits or a meter can be locked away separately.
Designed, Fabricated and Welded in Florida UWS designs, fabricates and welds its tool boxes at its own plant in Florida. That is unusual at this price and it shows up in the things that are hard to fix later: consistent weld quality, lids that sit square, and gaskets that actually meet all the way round.
Patented RigidCore Foam-Filled Lid UWS fills the lid with a solid foam core instead of leaving it hollow. That is what stops a long lid from flexing in the middle, binding in its own opening or drumming as you drive. On a 48" lid this is the difference between a box that still latches cleanly after a few years and one that has to be pushed down to catch.
Fitment & Compatibility
Application
Fit
Passenger-side wheel well, full-size pickup
✓ Yes, this is the intended application
Opposite side of the truck
✗ No, order the matching driver-side part instead
Mid-size pickup
● Measure first, wheel well height and bed length vary considerably
Fit guidance: This box is handed. It is the passenger-side box only, and it is sold as a single box, not a pair. It is cut to sit over the wheel well fender, so measure the height of your arch and the length of bed available alongside it before ordering. Mounting hardware is not included; UWS states you must supply bolts to suit your truck.
Specifications
UWS Part Number: EC30021
Box Style: Wheel Well Tool Box, Standard Profile
Finish: Bright Aluminum diamond plate
Material: 0.058" one-piece aluminum
Storage Capacity: 3.9ft³
Overall Length: 48"
Overall Width: 8.75"
Overall Height: 24.75"
Angled Section Height: 11.75"
Upper Section Height: 13"
Lid Type: Single Lid
Door Style: Single-Door
Latch / Handle: T-Handle / Paddle Handle
Lid Core: Patented RigidCore foam-filled
Weather Sealing: MicroSeal full-perimeter gasket
Installation Difficulty: Easy
Product Weight: 34.4 lb
Shipping Weight: 44.61 lb
UPC: 672078080804
Warranty: Limited lifetime, one-year finish, one-year parts
Origin: Designed, fabricated and welded in Florida, USA
Installation
Type: Bolt-in · Time: About 30 to 60 minutes · Tools: Socket set, drill and bit if your application is not pre-drilled, tape measure, marker; a second person to lift and hold the box · Difficulty: Easy, DIY-friendly
Set the box over the wheel well so it sits flat on the bed floor and clears the arch, mark through the mounting slots and bolt down. Check under the bed for lines and the spare wheel winch before you drill. Remember this is a single handed box, not a pair.
Resources
Everything you need for your UWS 48" Passenger-Side Wheel Well Tool Box, Bright Aluminum, in one place.
Warranty. UWS limited lifetime warranty on the box, with one year on the finish and one year on parts. Damage from overloading, accident, modification or improper installation is not covered, and the warranty is offered to the original purchaser.
Free shipping. This item ships free to the lower 48 states. Because it is an oversized item, it ships by freight and typically arrives in 3 to 7 business days.
Inspect on delivery. Please inspect the packaging before signing. If you see any damage, note it on the delivery receipt and contact us right away, and we will make it right.
About UWS
UWS, United Welding Services, has been welding aluminum truck boxes in Florida since 1988. It is now part of the Lippert and CURT Group family, which is what gives a box at this price a real dealer network, real parts support and a warranty that means something years later. What has not changed is where the boxes are made: UWS designs, fabricates and welds them at its own plant rather than importing finished bodies, and that is visible in the details that cannot be fixed after the fact, such as square lids, consistent welds and gaskets that meet cleanly all the way around the opening.
Two UWS features do most of the work in this wheel well tool box. The first is the patented RigidCore lid, filled with a solid foam core instead of left hollow, which is what stops a long lid flexing in the middle, drumming at speed or binding in its own opening as the box ages. The second is MicroSeal, a full-perimeter gasket that compresses as the lid closes and keeps out the rain, road spray and fine grit that ruin the contents of a cheaper box. Underneath both is a 0.058" one-piece aluminum tub, thicker than most of the competition and immune to the rust that eventually kills a painted steel box.
Prestige Truck is an authorized UWS dealer. Every box we ship is new, factory-packed, covered by the full UWS limited lifetime warranty and supported by UWS's US-based parts and service team.
Compare The Range
How this compares to similar models
The closest alternatives side by side, so you do not have to keep tabs open.
Model
This OneUWS 48" Passenger-Side Wheel Well Tool Box, Bright Aluminum (EC30021)
RigidCore Strength Test: Tool Box Vs. Pickup Truck
UWS drives a pickup onto one of its RigidCore lids.
It is a marketing stunt and it is also the clearest demonstration of what the foam core actually does, which is stop a long lid flexing, denting or binding in its own opening. This box uses the same RigidCore lid.
MicroSeal Weather Test: Mud And A Pressure Washer
UWS buries a box in mud and then turns a pressure washer on it to show what the MicroSeal gasket keeps out.
Worth two minutes if you are deciding between this and a cheaper box with a plain foam strip, because sealing is the thing you only notice once it has failed.
UWS Damage-Free Delivery
This part is the heavy-packaging version of the box, crated so it can travel by parcel carrier instead of freight.
This short UWS film shows the packaging system that makes that possible and what the carton should look like when it reaches you. Inspect the carton on arrival and photograph any damage before you sign.
Frequently Asked Questions
Straight answers on specs, fit and support
What are the actual dimensions, and will it fit my truck?
The box is 48" long, 8.75" deep and 24.75" tall overall, and it holds 3.9ft³. Measure the flat space you have available before ordering.
Is the mounting hardware included?
No. The carton holds the box and 2 keys. UWS states that you must supply your own hardware to suit your truck.
What is the difference between this and the standard UWS part?
This is the heavy-packaging version of the UWS box, crated for parcel shipment rather than freight. The box, the materials and the warranty are the same.
How well does it keep water out?
A MicroSeal gasket runs the full perimeter of the opening and compresses as the lid closes. No tool box is a submarine, and a box that is pressure washed straight at the seam or parked nose-down in standing water can still take some in, but in normal service it stays dry inside. Keep the gasket clean and it will keep sealing.
What is the finish, and how does it hold up?
Bright aluminum diamond plate, which is the mill finish of the aluminum itself rather than a coating. It cannot chip or peel because there is nothing on top to come off, and aluminum does not rust. It will dull and pick up a patina over the years, which most owners either like or polish back.
Does the lid stay open on its own?
Yes. Release the T-handle and the RigidCore lid lifts and holds itself open at close to 90 degrees, so you have both hands free. The foam-filled lid is light enough for the mechanism to manage but stiff enough not to flex on the way up.
Mark K.
Look is great. 100 lbs
Look is great. 100 lbs lighter than my 2nd pick. Lid lock and opening are smooth. Only minor knock I give is the the tie down hooks are hard to install - thinking I should have done them before installing.
DECKED Tool Box, Full-Size Truck Crossbed, 71.7" x 25.5" x 16", 300 lb Lid / 800 lb Tub, Black (DTB2-BLK)
Mark
A must have
I really like this mat. I was apprehensive at first but, the mat does a great job of keeping things from sliding around without having to secure it. perfect fit. But i think i will be adding some short screws to secure the mat to the DECKED system.
DECKED Battle Mat, Full-Size Long Drawer System 6'4" to 6'9" Bed, Recycled Nyracord Rubber, Black (A0075-BMXL-BLK)
Roy L.
I never knew how much I needed this
As with all BAK covers, the quality is amazing. What I didnt fully appreciate until installing was the ease of opening - especially in a lifted truck. No more need to find the right handhold. Just roll it back with a single hand. Its also great to see out of my rear window when fully open - something you lose with the fold back covers. Customer service is awesome. I has an installation question and the representative stayed on the line as I adjusted an alignment to ensure I did it properly.
BAK Revolver X4s Hard Roll-Up Tonneau Cover for 2022-2026 Toyota Tundra (6'7" Bed)
Jeffrey P.
Better then expected.
Searched for about 6 months to find the tonneau cover. I really wanted the security of a hard top without sticking above the bed rails it checked those boxes. I also did not want to drill my truck bed. The install was super simple my wife and I had it on the truck in about a half an hour.
BAKFlip MX4 Hard Folding Tonneau Cover for 2003-2025 Ram 1500 / 2500 / 3500 (8' Bed)
Joseph A.
The toolbox is nice. I
The toolbox is nice. I think Ill get a lot of years of service out of it. I like how the lid opens and the tie downs are a nice touch. It seems to be well built. And tough. Im pleased with my purchase and would buy another one.
DECKED Tool Box, Full-Size Truck Crossbed, 71.7" x 25.5" x 16", 300 lb Lid / 800 lb Tub, Fender Dirt (DTB2-TAN)
UWS 48" Passenger-Side Wheel Well Tool Box, Bright Aluminum (EC30021)
UWS 48" Driver-Side Wheel Well Truck Tool Box with Drawers, Bright Aluminum (FW-48-DS-D)
Weather Guard 530 Underbed Truck Tool Box, 30 in Black Steel, 5.6 cu ft (530-5-02)
UWS 55" Wedge Utility Chest Box, Bright Aluminum (EC20291)
