The UWS EC10112 is a 54" low-profile crossover truck tool box in gloss black aluminum. It sits across your bed rails behind the cab and clamps down without a single hole drilled in the truck. It spans 55" overall, holds 6.3ft³, and the tub that drops between your rails measures 44" x 17" x 11.75". The low-profile lid keeps the box to 14.75" tall overall, low enough to stay out of your rear-view sightline on most trucks and under many tonneau covers. The lid is UWS's patented RigidCore design, foam-filled so it does not bow or bind, with gas struts that lift it to a full 90 degrees and hold it there. A MicroSeal gasket runs the perimeter to keep dust and water out. Two keyed latches connected inside the box mean you can open it from whichever side of the truck you are standing on. Because this is the EC version, UWS packages it for parcel delivery rather than freight, so it comes to your door without a terminal pickup or a delivery window.
What's Included:
UWS 54" crossover truck tool box, gloss black aluminum
1 divider tray (the sliding tool tray)
2 keys
2 rail pads
2 J-hooks, 3"
2 washers, 1/4"
2 nuts, 1/4"
UWS installation manual
Features
6.3ft³ of Lockable Storage The box measures 55" x 20" x 14.75" overall and holds 6.3ft³. The tub itself is 44" x 17" x 11.75", which is the space you actually load, and it is the figure to check against your longest tools. Capacity is UWS's own published figure for this model, not a category average.
Patented RigidCore Foam-Filled Lid The lid is not a hollow aluminum shell. UWS injects a solid foam core between two sheets of aluminum, which stiffens the whole panel so it does not bow in the middle, does not warp in the sun, and does not bind in the latches after a few hundred cycles. It is the difference you notice every time the lid closes squarely instead of needing a shove.
Extra-Thick One-Piece Welded Aluminum Tub The tub is formed from a single sheet of 0.058" extra-thick aluminum and welded, rather than riveted or folded from panels. There are no seams down the corners to leak or split, and aluminum will not rust out from the inside the way a painted steel box does once the coating is chipped.
Gloss Black Powder Coat Over Aluminum The gloss black powder coat finish is applied over aluminum, so even where the coating eventually gets chipped there is no steel underneath to rust. Gloss black gives a deep, wet-looking shine that matches factory black trim and black wheels.
Stainless Steel Paddle Latches, Locking From Either Side Two recessed stainless steel paddle latches with keyed locks, connected inside the box so it opens from the driver's side or the passenger's side. Recessing the latch into the box face means there is nothing sticking out to catch a hip or a cargo strap, and stainless means the lock still turns after a salt winter.
MicroSeal Gasket Around the Lid A closed-cell gasket runs the full perimeter of the opening and compresses when the lid shuts, which is what keeps dust, road spray and rain out of the box. UWS demonstrates it publicly by hitting a closed box with mud and then a pressure washer, and that video is linked on this page.
Self-Opening Lid That Stops at 90 Degrees Gas struts take the weight, so the lid lifts itself once the latches release and stays put at a full 90 degrees. That matters when your hands are full: you release the latch, the lid goes up, and it does not come back down on your knuckles while you are reaching in.
Packaged for Parcel Delivery, Not Freight This is the EC version of the box, which UWS packages specifically so it can ship by parcel carrier instead of on a freight pallet. In practice that means it comes to your door rather than to a terminal you have to drive to, and there is no appointment window to sit through. The box inside is the same box as the freight-only version; only the packaging differs.
Fitment & Compatibility
Truck class
Fit
Compact and mid-size trucks (Tacoma, Ranger, Colorado, Frontier)
✓ Yes, comfortable fit
Mid-size trucks with wider beds (Gladiator, Ridgeline)
Full-size heavy duty trucks (F-250/350, Silverado 2500/3500, Ram 2500/3500)
✓ Yes, comfortable fit
Trailers, flatbeds and service bodies
✗ No, this box is built to sit on pickup bed rails
Fit guidance: This is a universal-fit crossover box, not a vehicle-specific kit, so measure before you order. The number that matters is the outside-to-outside width across your bed rails just behind the cab: this box is 55" long overall and its mounting flanges rest on the rails, so your rail span needs to be a little under that figure. The tub that drops between your bed rails is 44" long and 17" wide, and that has to drop cleanly between the inner walls of the rails. The lid is the low-profile design, keeping the box to 14.75" tall overall so it usually stays out of the rear-window sightline. Also check tonneau cover and rear-window clearance if you run either. UWS publishes a short video on measuring a bed for a crossover box, linked on this page. No year, make and model fitment is claimed.
Specifications
UWS Part Number: EC10112
Product Type: Crossover tool box
Material: Aluminum
Finish: Gloss Black
Storage Capacity: 6.3ft³
Overall Length: 55"
Overall Width: 20"
Overall Height: 14.75"
Tub Length: 44"
Tub Width: 17"
Tub Height: 11.75"
Tub Style: Standard
Profile: Low Profile
Lid Type: Single Lid
Latch Type: Paddle Handle
Rail Option: Without Rail
Product Weight: 39 lb
Shipping Weight: 54.25 lb
Shipping Method: Parcel carrier, heavily packaged by UWS for parcel delivery
Installation Difficulty: Easy
UPC: 672078081252
Warranty: Limited lifetime warranty, one-year finish, one-year parts
Country of Origin: USA
Installation
Type: No-drill clamp mount, the box sits on the bed rails and is clamped from underneath · Time: About 20 to 30 minutes with a second person to lift the box · Tools: Ratchet and socket set, tape measure · Difficulty: Easy, no drilling and no cutting
Lay the two supplied rail pads on the bed rails so the box does not sit metal-to-metal on your paint, set the box down centered front to back and side to side, then fit the two 3" J-hooks from underneath with the 1/4" washers and nuts and draw them up evenly. Torque to about 3 ft-lb: these are clamping fasteners, not structural bolts, and overtightening will dimple the rail. Two keys are supplied. Open and close the lid before you walk away to confirm the box is square and the latches line up. This box is heavy and awkward, so lift it into the bed with two people.
Resources
Everything you need for your UWS 54" Low-Profile Crossover Truck Tool Box, Gloss Black, in one place.
Warranty. UWS limited lifetime warranty on the box, with one year on the finish and one year on parts. The warranty covers defects in materials and workmanship; it does not cover damage from overloading, misuse, accident, or improper installation, and it does not cover normal wear to the finish. Keep your proof of purchase. Prestige Truck is an authorized UWS dealer, so warranty claims are handled through the manufacturer's normal process.
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 since 1989 and is now part of the CURT Group within Lippert, which is what puts a national warranty and parts network behind what started as a fabrication shop. The company builds tool boxes, transfer tanks and chests for people who open them every working day, and the engineering choices reflect that: welded one-piece tubs instead of riveted panels, stainless steel latch hardware instead of plated steel, and a foam-filled lid instead of a hollow one.
Two of those choices are worth knowing by name. The patented RigidCore lid sandwiches a solid foam core between aluminum skins, so the lid stays flat and keeps latching squarely long after a hollow lid would have bowed in the middle. The MicroSeal gasket runs the full perimeter of the opening and is what keeps dust and water out. UWS is confident enough in the seal to publish a video of a closed box being hit with mud and then a pressure washer. UWS builds these boxes in Florida: the company's own product copy for this model says it is designed, fabricated and welded there, and the carton is marked Assembled in USA.
This particular listing is from the UWS EC series, which is the same box packaged so it can travel by parcel carrier rather than freight. That is worth money to you: the box arrives at your door instead of a freight terminal, without a delivery appointment to wait on.
Prestige Truck is an authorized UWS dealer. Every box we ship is new, in the manufacturer's carton, and covered by the full UWS limited lifetime warranty.
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 54" Low-Profile Crossover Truck Tool Box, Gloss Black (EC10112)
How To Measure Your Truck Bed For A Crossover Tool Box
Watch this before you order.
UWS shows exactly where to put the tape to get the rail-to-rail measurement that decides whether a crossover box fits, which is the measurement to compare against this box's overall length.
RigidCore Strength Test: Tool Box Vs Pickup Truck
UWS drives a pickup onto a closed box to show what the foam-filled RigidCore lid actually withstands.
It is a marketing stunt, but it is a fair demonstration of why a foam-cored lid does not bow in the middle the way a hollow one does.
MicroSeal Weather Test: Tool Box Vs Mud Vs Pressure Washer
UWS packs a closed box with clean rags, buries the outside in mud, then hits it with a pressure washer and opens it up.
It is the clearest demonstration of what the MicroSeal gasket on this box is actually doing.
Frequently Asked Questions
Straight answers on specs, fit and support
Will the EC10112 fit my truck?
Measure the outside-to-outside width across your bed rails just behind the cab and compare it with this box's 55" overall length. The mounting flanges rest on the rails, so you want a rail span a little under 55". The tub is 44" long and 17" wide and has to drop cleanly between the inner rail walls. As a rough guide, 55" suits compact and mid-size trucks. We do not publish year, make and model fitment for these boxes, so measure rather than assume.
How much does the EC10112 actually hold?
6.3ft³. The usable tub is 44" x 17" x 11.75", which is the measurement to check your longest tool or your tool case against. That figure is UWS's own published capacity for this exact model.
Do I have to drill my truck to fit it?
No. The box sits on two supplied rail pads on your bed rails and clamps down with two 3" J-hooks that hook under the rail lip, secured with the supplied washers and nuts. No holes, no cutting, and it comes off again cleanly if you sell the truck. Budget about 20 to 30 minutes and get a second person to help lift it in.
How does it lock, and can I open it from either side?
It uses two keyed stainless steel paddle latches, and two keys are supplied. The handles are joined by a connecting rod that runs inside the box, so you can lock, unlock and open it from the driver's side or the passenger's side without walking around the truck, and the rod is not reachable from outside.
What is the difference between the EC10112 and the freight-shipped version?
Packaging, not product. UWS builds the EC series as the same box in heavier protective packaging so it can travel by parcel carrier instead of on a freight pallet. For you it means doorstep delivery instead of a freight terminal, and no delivery appointment to wait in for.
Is this gloss black or matte black?
Gloss black. It is a deep, reflective powder coat over aluminum, the finish that matches factory black trim and black wheels. UWS also builds a matte black version of several boxes in this range if you would rather have a flat, non-reflective look. Because the substrate is aluminum, a chip cannot start rust.
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