Keep tools locked down and off the bed floor with the Weather Guard 184-6-04 lo-side truck tool box. This 41" box wears a gunmetal gray ARMOR TUF finish over aluminum diamond plate. Gunmetal gray sits between bright aluminum and blacked-out, a modern metallic tone that looks factory-fresh next to today's gray and silver trucks. It mounts on top of one bed side rail so it rides low, preserves your rear visibility and leaves the bed floor open for sheet goods and cargo, and it locks down 3.0ft³ of weather-sealed storage behind the tamper-resistant 1Key UltraLock push-button lock. Aluminum keeps it lighter than a comparable steel box, so it will not eat into your payload.
What's Included:
184 Series 41" Lo-Side aluminum truck tool box in gunmetal
1Key UltraLock keyed cylinder with recessed red push-button latch
Under-rail mounting clamps and hardware for a no-drill install
Gas strut for controlled lid lift
Removable tray
Full-perimeter weather seal, pre-installed
Drain plug
Weather Guard installation instructions
Features
41" of Secure Side-Rail Storage At 41" long the 184-6-04 runs along one bed side rail and gives you 3.0ft³ of lockable, organized storage while keeping the rest of the bed floor clear. The compact footprint fits full-size and mid-size trucks and leaves room for larger cargo.
Gunmetal Diamond Plate Finish A Gunmetal Gray ARMOR TUF powder coat gives the aluminum diamond plate a modern, metallic-gray tone that resists corrosion and fading. It is an easy match for gray, silver and blacked-out trucks that want something other than plain bright aluminum.
Modern Metallic Tone Gunmetal gray is the understated, modern pick, and it blends in cleanly with gray, silver, charcoal and black trucks. It gives you something more distinctive than bright aluminum without going fully blacked-out.
Lightweight Welded Aluminum Build The 184-6-04 is built from welded aluminum diamond plate, so it resists corrosion and dents while staying lighter than a comparable steel box. It is made in the USA and backed by a Weather Guard Limited Lifetime Warranty against defects.
1Key UltraLock Security A tamper-resistant lock pairs a keyed cylinder with a recessed red push-button that sits flush when locked, giving you a quick visual cue your gear is secured. The 1Key system lets you code multiple boxes on a truck or a whole fleet to one key.
Low-Side Rail Mount The Lo-Side design sits on top of one bed side rail and stays low, so it does not block your rear window and leaves the bed floor open for hauling. It mounts on either the driver or passenger side rail, whichever suits your loading.
Reinforced Body, Automotive-Grade Hardware Weather Guard specifies a heavy-duty welded body for the 184-6-04, with a C-channel reinforced front panel and a heavy-duty C-channel reinforced lid, so the box stays square when it is loaded and when someone stands on the lid. The latch is an automotive dual-stage rotary mechanism, the same style a truck door uses, so it pulls the lid down onto the seal instead of relying on a friction catch. A welded gas strut shield keeps loose tools from knocking the strut mount out of line. The D-shaped ribbed weather strip is memory resistant, so it springs back after years of closing rather than taking a set and letting water track in.
✓ Yes, a great short-box fit, measure the rail first
Very and heavy accessories
5'
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● Measure first, confirm rail clearance behind the cab
Fit guidance: Lo-Side boxes mount on top of one bed side rail and keep the bed floor open for cargo. At 41" long this is the versatile short box, so it fits full-size trucks with rail to spare and fits most mid-size and compact pickups. It mounts on either the driver or passenger side rail. Always measure your usable bed side rail length and confirm clearance behind the cab before ordering.
Specifications
Series: 184 Series Lo-Side
Style: 41" single-lid side-mount (Lo-Side)
Storage Capacity: 3.0ft³
Exterior Dimensions: about 41"L x 17"W x 13"H
Material: Welded aluminum diamond plate
Finish: Gunmetal Gray ARMOR TUF powder coat
Lid: Reinforced, opens to about 90 degrees, gas strut
Lock: 1Key UltraLock keyed cylinder with recessed red push-button, tamper-resistant, keyed alike
Weather Seal: Full-perimeter, multi-ridge weather seal
Mounting: Sits on top of one bed side rail, under-rail clamps and hardware included, no drilling required
Type: Side-rail mount, clamp-in with no drilling · Time: About 20 to 30 minutes · Tools: Socket or wrench set and a tape measure; no drill needed with the included under-rail clamps · Difficulty: Easy, one person can handle this short box
Set the box on top of one bed side rail and position it front to back, then hook the included clamps under the rail lip and tighten the hardware evenly so the box sits flat and the lid seals. Follow the Weather Guard installation instructions for exact clamp placement and torque.
Watch the installation walkthrough:
Resources
Everything you need for your Weather Guard 184 Lo-Side Truck Tool Box, 41" Gunmetal Aluminum Diamond Plate, in one place.
Warranty. Limited Lifetime Warranty from Weather Guard against defects in materials and workmanship.
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 Weather Guard
Weather Guard has built professional-grade truck and van storage in the USA for decades and is the storage brand tradespeople, contractors, and fleets reach for first. Its steel and aluminum tool boxes, ladder racks, and van-interior systems are engineered to survive daily jobsite abuse and keep expensive tools secure and organized.
Known for weather-tight seals, patented locking systems, and heavy-gauge construction, Weather Guard products mount cleanly on work trucks and vans and stand up to years of hard use. The lineup spans crossover, low-side, and saddle truck boxes, ladder and van racks, drawer units, and fuel and utility tanks, so an entire work vehicle can be outfitted from one brand.
Backed by a strong manufacturer warranty and US-based support, Weather Guard is the name pros trust to protect the tools their livelihood depends on.
Authorized Weather Guard dealer. Prestige Truck is an authorized dealer of Weather Guard, so every tool box, rack and storage product you buy is 100% genuine and factory-new, covered by the full Weather Guard manufacturer warranty, and backed by our own US-based support 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 OneWeather Guard 184 Lo-Side Truck Tool Box, 41 in Gunmetal Aluminum Diamond Plate (184-6-04)
A step-by-step look from Weather Guard at what the 1Key UltraLock actually does: how the cylinder accepts a new code, why the red push button retracts when the box is locked, and how the latch pulls the lid down against the seal. Worth two minutes before you set the box up.
How to Code Your 1Key UltraLock Lock
Weather Guard's official walkthrough for coding the lock so this box opens with the same key as the rest of your Weather Guard boxes. Follow it once when the box arrives and you can stop carrying a separate key for every lid on the truck.
Protect Your Gear and Your Reputation
Weather Guard's own film on why a working truck earns its keep from what is bolted to it. It frames the boxes, racks and bed equipment as the difference between arriving ready and arriving short, which is the thing a customer actually notices.
It is a short manufacturer-made overview rather than a product demo, so watch it for the why rather than the how. If you are outfitting a truck from scratch it is a useful place to start before you pick individual part numbers.
Frequently Asked Questions
Straight answers on specs, fit and support
What bed size do I need for the 184-6-04?
This box is 41" long, the versatile short size, so it fits full-size trucks with rail to spare and fits most mid-size and compact pickups. It mounts on one bed side rail, so measure your usable rail length and confirm clearance behind the cab before ordering.
What is the finish on the 184-6-04?
It is aluminum diamond plate finished in Gunmetal Gray ARMOR TUF powder coat, an understated metallic gray. It resists corrosion and fading and pairs cleanly with gray, silver and blacked-out trucks.
What trucks does gunmetal look best on?
Gunmetal gray looks factory-right on gray, silver, charcoal and black trucks, and it is a clean step up from plain bright aluminum. Choose it when you want a modern, understated look rather than a fully blacked-out box.
Which side of the bed does it mount on?
You can mount it on the driver or passenger side rail, whichever suits your loading and access. It sits low on the rail, so it keeps the bed floor open and your rear view clear either way.
How does it lock?
It uses the Weather Guard 1Key UltraLock, a tamper-resistant design that pairs a keyed cylinder with a recessed red push-button that sits flush when locked. The 1Key system also lets you code multiple boxes on a truck or an entire fleet to a single key.
Will it keep my tools dry?
Yes. A memory-resistant, multi-ridge weather strip runs the full lid perimeter to seal out rain, dust and debris, the reinforced lid closes tight on a gas strut, and a drain plug lets any moisture escape.
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