UWS Low Profile Tool Box Review: Dry for Years, Buy by the Fit Guide

Buy a UWS low-profile crossover box if you want a dry, locking box across the front of the bed that sits low enough to keep your rear window clear and still lets long boards slide underneath. It's the box truck owners keep for a decade and carry from one truck to the next. Order it by the part number UWS's fit guide lists for your truck, not by a photo of someone else's, and plan on replacing the two stock J-hooks before you load it heavy.

UWS sits between hardware-store boxes and Weather Guard, and that middle spot holds up. Every current low-profile box has a one-piece welded aluminum tub, a foam-filled lid UWS calls RigidCore and a MicroSeal gasket, and UWS builds them in Florida. Today they're sold as the EC series, packed for parcel shipping, alongside the older TBS part numbers that ship by freight. We'd skip a crossover box entirely if you have a RamBox bed, a 5.5 ft bed you fill to the tailgate, or you want a tonneau cover over the whole bed.

The short version

What works:

• Dry for years: a decade outdoors with no water inside is the normal story for these boxes, and UWS fits every one with a MicroSeal gasket.
• Low on the rails: UWS builds the low-profile boxes lower on the bed rail for a better view out the rear window. Plywood and lumber still slide under the box.
• A real fit guide: UWS publishes which box fits which truck by years, cab and bed length, and it covers nine of the ten truck generations we track.
• Simple install: two J-hooks under the bed rails and two nuts, no drilling for the standard mount.
• Warranty: lifetime coverage on workmanship and materials for the box itself.

What to watch:

• Stock J-hooks: the box ships with two 3 in J-hooks, one per side. They're too light for a box you load with heavy tools.
• Finish: black powder coat dulls and can peel after years outside, and the finish warranty is one year.
• Thin walls: low-profile boxes dent more easily than thicker premium boxes, and UWS publishes no lid or box load rating.
• Lost tie-downs: the box crowds the front bed tie-downs, which hurts most on a 5.5 ft bed.
• What it rules out: RamBox beds, factory hard-plastic tonneau systems that cover the rails, and a tonneau cover over the full bed.

Which trucks and beds it fits

UWS sizes its crossover boxes by width (60, 63, 69 and 72 in) and publishes a crossover application guide by make, model, years, cab and bed length. The Amazon listings name no trucks at all, so every fit below comes from that guide, matched to the part number on the listing. Where we link an EC box, UWS's own part pages name it as the parcel-packed equivalent of the guide's TBS part. Years are as the guide prints them, including model years that haven't started yet.

The fitment table under the score panel carries each row with its cab and the guide's notes. The guide also lists slim, deep and rail versions for most of these trucks; the widths stay the same, so if you'd rather have a slim box, match the width in the table.

• RamBox: no crossover box works. UWS's guide puts it plainly: "If your model is equipped with a Ram Box, a crossover tool box will not fit." The Ram 1500 Classic (DS) is a separate row on the guide that calls for 72 in boxes, so don't cross-shop it with the DT.
• GM width: the guide lists 69 in boxes for 2007-2026 Silverado and Sierra 1500s, so an older claim that GM's wide rails need a 72 in box doesn't match UWS's own chart. The 72 in boxes on the guide go to other trucks, like the 2011-2018 Ram 1500 and the Ram 1500 Classic.
• Tacoma: get the angled box. The angle clears the wheel wells, and a deeper or non-beveled box can hit them even in a long bed. The guide lists the 63 in angled box for the 2019-2024 Double Cab short bed and the 2019-2023 Access Cab, notes that a factory bed-rail system may change how the box mounts, and lists no 2016-2018 Tacoma and no Double Cab long bed. Its Double Cab row runs to 2024 with no separate 4th gen row, so 4th gen owners should confirm with UWS before ordering. One Double Cab long bed owner runs a 60 in box instead, a width the guide doesn't list for the Tacoma, to clear the wheel wells and keep the box inset from the bed sides with room to run a strap around it.
• Tundra: one owner of a new 2022 short bed found no match in UWS's vehicle finder. The current guide lists the 2022-2026 Tundra 5 ft 5 in bed with the 69 in box. Another owner has kept a UWS box in place since 2022 with aftermarket aluminum J-hooks tightened inside the bed's rail system.
• Maverick, Ranger and Colorado/Canyon: the Maverick takes the 60 in angled box, the 2024-on Ranger crew a 63 in box and the 2023-on Colorado and Canyon a 60 in box.

The specs that matter

UWS publishes dimensions, storage volume and weight for every box, and nothing on load: no lid rating, no box rating and no install time. Here are the boxes we link, plus the 69 in slim and 72 in for comparison, from UWS's part pages:

Every box shares a 0.058 in one-piece welded aluminum tub, the foam-filled RigidCore lid, the MicroSeal gasket, stainless steel paddle handles linked by a rod so either side opens the lid, and a lid that self-opens to 90 degrees. The angled boxes narrow toward the bottom to clear the wheel wells: the 60 in tub is 50 in long at the top and 35.75 in at the angled bottom.

The slim box is the trade most buyers should run through. Going from the standard 69 in box to the slim one gives back 20 - 12.75 = 7.25 in of bed length and leaves more room underneath, but storage drops from 8.4 to 3.5 cu ft, about 42% of the standard box. A slim box holds tow straps, jumper cables and a few hand tools; a bottle jack standing upright or a full set of cordless tools wants the standard depth. UWS also sells deep slim boxes, like the 72 in EC10882 at 6.5 cu ft with a 15.5 in deep tub, for trucks with little room in front of the wheel wells.

Weight is small. The 69 in box is 47.4 lb, so the payload that matters is what goes inside it, plus everything else in the bed and cab. UWS's install sheet says to never exceed the vehicle manufacturer's recommended capacity; your payload figure is on the door-jamb sticker.

The missing load rating matters more. Plenty of owners sit and stand on these lids, and one owner cites a rating UWS doesn't publish. With no published figure, we wouldn't treat the lid as a step or a seat. UWS's current tub is 0.058 in aluminum, and an older, discontinued UWS listing still on Amazon describes 0.063 in, so today's box isn't built heavier than the ones with the long track record.

Leaks, finish and security

Water is where UWS earns its reputation. The lid seals, the tub is one welded piece, and boxes that have lived outdoors for a decade with tools inside still come up dry. No owner describes water getting into a UWS box. The gasket is a wear part on any box, so check it if the lid starts closing loose.

The finish is the weak spot. UWS's gloss black is powder coat over aluminum, and after years in the sun black dulls and oxidizes, especially on the lid, and powder coat can flake off. UWS's warranty covers finishes and coatings for one year and excludes color fade. If looks after year five matter to you, bright aluminum ages better, since it can be polished back.

Security is a deterrent, not a safe. The stainless paddle locks keep honest people out and a crowbar user in for a short fight; any aluminum box can be pried open by someone who wants what's inside. If you carry expensive tools overnight in a hotel lot, a heavy steel job box or the cab is the safer place.

One rule from UWS's install sheet catches a lot of owners: don't store flammables in the box. UWS lists containers of gasoline, solvents and propane tanks by name. Keep fuel cans out of it.

Build quality and living with it

The long-term record is the best argument for UWS. Six owners describe one box lasting from seven to thirteen years, and the typical story ends with the box moving to the next truck, a Frontier to a Tacoma, or the same box in three Tundras. Latches stay smooth, the lid closes without much effort, and next to a cheaper box with one lift strut, UWS's two struts and solid lid feel like a different class. Most of that record belongs to boxes built before the EC packaging, so the current boxes have less history of their own.

Low-profile walls are thin, and a hard hit dents them. One owner dented a brand-new box loading a riding mower and stiffened it with angle iron and carriage bolts. If you load heavy, awkward items past the box, it's going to take a hit eventually, and owners say Weather Guard's thicker boxes handle that better.

• Tie-downs: the two stock J-hooks are the first thing we'd replace. A box loaded with tools needs more grip on the rails than one thin hook per side, and aftermarket box tie-downs from Dee Zee or JGR are the usual swap. Don't use the box as an anchor for cargo straps either; two J-hooks hold it, and it isn't built as a tie-down point.
• Bed tie-downs: a crossover box sits over or right next to the front tie-downs. On one 2018 F-150 the front hooks were still reachable at an awkward angle, but a strap to a tall load rubs the box. On a 5.5 ft bed the lower front cleat is mostly lost. One F-150 owner kept the BoxLink cleats usable with a 72 in deep slim box, a size UWS's guide doesn't list for the F-150, so match the slim width to the guide instead.
• Bed covers: a crossover box and a full-bed tonneau don't go together, and owners have pulled their UWS boxes to run a cover. You can run a roll-up cover from the box back to the tailgate, and UWS says a factory hard-plastic tonneau system that covers the bed rails rules out a crossover box.
• Shipping damage: boxes have arrived badly dented; one owner went through two damaged boxes before getting a usable one. The EC boxes ship in UWS's heavier parcel packaging, but the warranty excludes shipping damage even when UWS arranged the freight, so open the carton and inspect it the day it arrives and refuse or return a damaged box through the seller.

Read the warranty before you plan a second truck. UWS covers the box's workmanship and materials for life, but only for the original retail purchaser and only on the original installation, and it isn't transferable. Moving the box to your next truck, the most common UWS story there is, ends the coverage. The parts warranty and the finish warranty are one year each. UWS's warranty document also describes products sold by and purchased from UWS, and some Amazon listings for these boxes come from third-party sellers, so if the warranty matters to you, ask UWS whether your seller counts before you buy.

How it compares

UWS's real rival is Weather Guard, the box owners name as the best. A DECKED drawer system and a pair of SwingCase boxes solve the same problem a different way. Specs come from UWS's part pages, DECKED's technical specs page and each Amazon listing:

Weather Guard costs noticeably more; owners credit it with thicker aluminum, and it adds a push-button lock and a bigger box. If the box takes daily jobsite abuse, that's the one we'd pay for. Weather Guard isn't immune to weather either; a brand-new one let in handfuls of snow for one owner, while others have run theirs dry for years. For a box that holds tools and recovery gear on a personal truck, UWS keeps water out just as well for less money. We haven't reviewed Weather Guard, and its listing names no trucks, so check fit before you order.

Hardware-store boxes from Tractor Supply, Kobalt or Husky cost less, and some owners are happy with theirs. The ones we'd avoid are the thin, flexing boxes that dent and leak once someone leans on them. UWS is worth the step up if the box will live outdoors for years.

DECKED is a different answer: lockable drawers across the whole bed floor instead of a box at the cab. It costs far more and gives up about a foot of bed depth, but nothing slides around and nothing sits up in the rear window. A pair of SwingCase boxes is noticeably cheaper and works under a tonneau cover, which a crossover box can't, at the cost of much less storage. Check the restrictions on your listing: the Ram version won't fit RamBox, the Silverado boxes won't fit the CarbonPro bed or MultiPro tailgate, and the Tundra boxes are for trucks without the Trail Edition bed boxes.

Installing it

UWS rates the install easy, and its install sheet lists a ratchet, a socket set and a tape measure as the only tools:

• Pads: stick the two adhesive rail pads to the underside of the box ends.
• Position: set the box on the bed rails, center it with a tape measure, and open the lid to make sure it clears the top and back of the cab.
• J-hooks: put one J-hook under the lip of each bed rail, up through the slot in the box, and add the washer and nut. Snug both sides, re-measure, then tighten. UWS's sheet says to use only one hole and J-hook per side.
• Strikers: the strikers adjust if the lid doesn't latch cleanly; loosen, adjust and re-tighten.

The standard mount needs no drilling. If you bolt through the bed instead, UWS's sheet says to check under the truck first so you don't hit brake or fuel lines, wiring or the fuel tank, and to seal every hole against corrosion. Follow the hardware guidance on UWS's sheet for tightening rather than guessing. Factory rail systems change the mount: UWS notes that on a Tacoma with the factory bed-rail system, standard box mounting may not apply, and on a Tundra the usual fix is aftermarket J-hooks clamped inside the rail. Re-check the hardware periodically; UWS's sheet asks you to make sure the mounting hardware stays tight.

Buy it if the bed stays mostly open

Buy the UWS low-profile box if you want tools and gear dry and locked at the front of an open bed, and you can live without the first couple of feet of bed floor. Get the width UWS's guide lists for your truck, pick standard depth unless you need the floor space a slim box leaves, and swap the stock J-hooks for a sturdier set on day one. That box will likely outlast the truck.

Pass if you have a RamBox bed, since UWS says no crossover box fits it. Pass too if you want a tonneau cover over the whole bed, or you haul 4x8 sheets flat in a short bed: a 5.5 ft bed gets short fast with a box across the front. A pair of SwingCase boxes under a cover or a DECKED system fits those trucks better, and if the box will take daily jobsite abuse, Weather Guard earns its higher price.