Weather Guard 178 Low Profile Lo-Side Truck Tool Box, 56" Gloss Black Aluminum Diamond Plate (178-5-04)

Keep tools locked down and off the bed floor with the Weather Guard 178-5-04 low profile lo-side truck tool box. This 56" box wears a deep gloss black ARMOR TUF finish over aluminum diamond plate. Gloss black turns a plain work box into a finished, blacked-out upgrade with a deep shine that stands out against a bright bed. 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 4.0ft³ 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:

• 178 Series 56" Low Profile Lo-Side aluminum truck tool box in gloss black
• 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

56" of Secure Side-Rail Storage
At 56" long the 178-5-04 runs along one bed side rail and gives you 4.0ft³ of lockable, organized storage while keeping the rest of the bed floor clear. It carries a full day of hand and power tools without taking over the bed.

Gloss Black Diamond Plate Finish
A Gloss Black ARMOR TUF powder coat wraps the aluminum diamond plate in a deep, glossy black that fights chips, road salt and UV fade. It gives a working truck a finished, blacked-out look without the added weight of steel.

Blacked-Out Curb Appeal
Gloss black is the go-to for a modern, blacked-out truck, and it ties in with black bumpers, black wheels and black trim packages. The deep gloss reads as an upgrade over plain aluminum without adding the weight of steel.

Gas Strut and Reinforced Lid
A gas strut controls how the reinforced lid opens and closes for smooth, one-handed access, and the lid opens to about 90 degrees and resists flex even when you lean on it. An optimized latch needs less force to close.

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.

Full-Perimeter Weather Seal
A memory-resistant, multi-ridge weather strip runs the entire lid perimeter to keep rain, dust and debris out, and a drain plug lets any moisture that does get in escape, so your tools stay dry and ready on wet and dusty jobsites.

Reinforced Body, Automotive-Grade Hardware
Weather Guard specifies a heavy-duty welded body for the 178-5-04, 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.

Fitment & Compatibility

Specifications

• Series: 178 Series Low Profile Lo-Side
• Style: 56" single-lid side-mount (Low Profile Lo-Side)
• Storage Capacity: 4.0ft³
• Exterior Dimensions: about 56"L x 17"W x 13"H
• Material: Welded aluminum diamond plate
• Finish: Gloss Black 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
• Electrical: 12V access for electrical upfits
• Drainage: Drain plug
• Construction: Heavy Duty Welded
• Front Panel: C-Channel Reinforced
• Lid Construction: Heavy Duty C-Channel Reinforced
• Latch Mechanism: Automotive Dual-Stage Rotary
• Weather Strip Profile: Memory Resistant D-Shaped Ribbed
• Gas Strut Protection: Welded Gas Strut Shield
• Bed Style: Style Side
• Shipping Size: 59"L x 19"W x 14"H, 49.5 lb
• UPC: 783965071543
• Weight: About 49.5 lb (shipping)
• Warranty: Limited Lifetime
• Made In: USA

Installation

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, best done with two people because of the length

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. Because the box is long, have a second person help lift and steady it while you clamp it down. Follow the Weather Guard installation instructions for exact clamp placement and torque.

Watch the installation walkthrough:

Resources

Everything you need for your Weather Guard 178 Low Profile Lo-Side Truck Tool Box, 56" Gloss Black Aluminum Diamond Plate, in one place.

• Official Weather Guard 178 Low Profile Lo-Side Truck Tool Box, 56" Gloss Black Aluminum Diamond Plate installation manual (PDF), the manufacturer's step-by-step guide covering mounting, included hardware and torque specs.

Warranty, Shipping & Returns

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.

Returns. Unused items in their original packaging can be returned within 30 days of delivery. If an item arrives damaged, defective or wrong, return shipping is on us. See our Returns & Refunds Policy, or email support@prestigetruck.com with any question.

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.