Weather Guard 391 Super Hi-Side Truck Tool Box, 90 in White Aluminum (391-3-02)

The Weather Guard 391-3-02 brings a clean, professional white finish to the high-capacity Super Hi-Side box. On a 90", 16-1/4" wide, 18" tall aluminum diamond-plate body it holds 15.2ft³, and the white ARMOR TUF powder coat matches fleet and service-truck livery while the aluminum shell shrugs off road salt at a fraction of steel's weight. It rides high on one rail of an 8' bed so the floor stays open, and 42" doors load long gear from either side.

What's Included:

• 391 Super Hi-Side aluminum diamond plate Hi-Side truck tool box, white
• Two side-opening doors with tool-less QuickClip hinges
• Two drill-resistant locking T-handle latches with three-point latching
• Under-rail mounting brackets and hardware for a no-drill install
• Removable parts bin
• Full-perimeter weather seal with rain gutter, pre-installed
• Weather Guard installation instructions

Features

Lightweight Aluminum Diamond Plate
The 391-3-02 is formed from welded aluminum diamond plate, so it adds locking storage without the weight penalty of steel. Aluminum naturally resists rust and corrosion, which keeps the box working and looking good through road salt and wet weather.

White ARMOR TUF Finish
A white ARMOR TUF powder coat covers the aluminum diamond plate to fight scratches, fading and corrosion and give your truck a clean white fleet look with a light aluminum body. ARMOR TUF is Weather Guard's toughest coating, built to hold up to sun, chemicals and the weather.

Twin Locking Doors, Drill-Resistant Locks
Two side-opening doors each use a drill-resistant lock core and a three-point latching system to resist break-ins, so gear on both ends of the box stays secure. The doors open wide for easy reach into the full 15.2ft³ interior.

Tool-Less QuickClip Doors
The doors adjust from 90 to 180 degrees and pop off with QuickClips, no tools required, so you can fully remove a door for loading and clip it back on in seconds. It makes packing long or bulky gear far easier.

Rain Gutter and Full Weather Seal
A rain gutter design paired with a full-perimeter weather seal keeps rain, dust and debris out of the box and off your tools. Your gear stays dry and ready in wet weather and on dusty jobsites.

Rides High, Frees Your Bed Floor
The Hi-Side design mounts on top of one bed side rail and stands up along the bedside, so your tools ride up and out of the way and the bed floor stays open for sheet goods, lumber and cargo. A removable parts bin keeps small items organized up top.

Removable Parts Bin and a Wide Door Opening
Each door on the 391-3-02 opens to a clear 14-3/4" high by 42" wide opening, which is enough to slide long hand tools and cases straight in from the side of the bed. A removable parts bin rides inside for fasteners, fittings and the small parts that otherwise end up loose in the bottom, and it lifts out when you need the full length of the box.

Fitment & Compatibility

Specifications

• Series: 391 Series Super Hi-Side
• Style: 18" top-mount side-rail box, twin side doors
• Storage Capacity: 15.2ft³
• Exterior Dimensions: 90-1/4"L x 16-1/4"W x 18"H
• Door Opening (each side): 14-3/4" high x 42" wide
• Material: Welded aluminum diamond plate
• Finish: White ARMOR TUF powder coat
• Doors: Two side-opening doors, tool-less QuickClip hinges, 90 to 180 degrees
• Latching: Drill-resistant lock core, three-point latching, each door
• Weather Seal: Rain gutter with full-perimeter weather seal
• Mounting: Mounts on top of one bed side rail, under-rail brackets and hardware included, no drilling required
• Construction: Heavy Duty Welded
• Lid Construction: Heavy Duty C-Channel Reinforced
• Weather Strip Profile: Memory Resistant D-Shaped Ribbed
• Key Alike: Key Alike On Request
• Bed Style: Style Side
• Shipping Size: 90-7/8"L x 17-1/4"W x 18-3/8"H, 85.5 lb
• UPC: 783965045353
• Weight: About 86 lb (83 lb shipping)
• Warranty: Limited Lifetime
• Made In: USA

Installation

Type: Top-of-rail side mount, clamp-in with no drilling  ·  Time: About 30 to 45 minutes  ·  Tools: Socket or wrench set and a tape measure; no drill needed with the included under-rail brackets  ·  Difficulty: Easy to moderate, best done with two people because of the 90" length and weight

Set the box on top of one bed side rail and position it front to back, then hook the included brackets under the rail lip and tighten the hardware evenly so the box sits flat and the doors seal. Because the box is 90" long, have a second person help lift and steady it while you clamp it down. Follow the Weather Guard Hi-Side and Super-Side installation instructions for exact bracket placement and torque.

Watch the installation walkthrough:

Resources

Everything you need for your Weather Guard 391 Super Hi-Side Truck Tool Box, 90" White Aluminum, in one place.

• Official Weather Guard 391 Super Hi-Side Truck Tool Box, 90" White Aluminum 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.