Weather Guard 390-5-02 Hi-Side box in gloss black, front three-quarter studio view with the doors closed
Weather Guard 390-5-02 Hi-Side box in gloss black, dimensional line drawing with the overall length, width and height called out

Weather Guard 390 Hi-Side Truck Tool Box, 90 in Black Aluminum (390-5-02)

$1,424.00 $1,960.99 Save $536.99
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Weather Guard Door Replacement Walkthrough

Weather Guard's official step-by-step guide to pulling and replacing a box door, filmed on a high-side box. Weather Guard publishes it on this box's own product page, so keep it bookmarked in case a door ever needs to come off for service or gets damaged on the job.

Weather Guard Truck Box Lineup and 1Key UltraLock

This official Weather Guard overview tours the current truck box lineup and the 1Key UltraLock security system that runs across it. You see how one coded key can open every Weather Guard box on the truck, from saddle to lo-side to hi-side, with a pop-up red button that tells you at a glance whether a box is locked. It highlights the sloped, reinforced lids and the ARMOR TUF powder coat that let these boxes shrug off weather and jobsite abuse. If you run more than one box, or a whole fleet, it shows why keying everything alike saves time every day.

Best Upgrade for Your Truck

This is Weather Guard's own brand film about outfitting a working pickup, built on the idea that the truck should already be loaded and organized before the day starts. It puts the bed and rail equipment in the context of a real work day rather than a spec sheet. Watch it if you are still deciding how much storage a truck actually needs. It is the clearest short look at how Weather Guard boxes, racks and drawer units are meant to work together on one vehicle, and it comes straight from the manufacturer rather than a reseller.

Weather Guard Door Replacement Walkthrough

Weather Guard's official step-by-step guide to pulling and replacing a box door, filmed on a high-side box. Weather Guard publishes it on this box's own product page, so keep it bookmarked in case a door ever needs to come off for service or gets damaged on the job.

Weather Guard Truck Box Lineup and 1Key UltraLock

This official Weather Guard overview tours the current truck box lineup and the 1Key UltraLock security system that runs across it. You see how one coded key can open every Weather Guard box on the truck, from saddle to lo-side to hi-side, with a pop-up red button that tells you at a glance whether a box is locked. It highlights the sloped, reinforced lids and the ARMOR TUF powder coat that let these boxes shrug off weather and jobsite abuse. If you run more than one box, or a whole fleet, it shows why keying everything alike saves time every day.

Best Upgrade for Your Truck

This is Weather Guard's own brand film about outfitting a working pickup, built on the idea that the truck should already be loaded and organized before the day starts. It puts the bed and rail equipment in the context of a real work day rather than a spec sheet. Watch it if you are still deciding how much storage a truck actually needs. It is the clearest short look at how Weather Guard boxes, racks and drawer units are meant to work together on one vehicle, and it comes straight from the manufacturer rather than a reseller.

Frequently Asked Questions

Straight answers on specs, fit and support

Will the 390-5-02 fit my truck?

The 390-5-02 is 90-1/4" long and requires a full-size 8' long bed; it is too long for a 6-1/2' or short bed. Measure your rail length and check cab clearance first. It mounts on either side rail and is not designed for mid-size or compact trucks.

Does it require drilling to install?

No. The box ships with under-rail brackets and hardware, so it clamps to the top of your bed side rail without drilling. Most installs take about 30 to 45 minutes and go easiest with two people to lift and hold the 90" box while you tighten the hardware.

How much does it weigh and is it strong?

It is built from welded aluminum diamond plate and weighs only about 74 lb shipping, far lighter than a comparable steel box, which saves payload and makes it easier to mount. Aluminum also naturally resists rust, so it holds up to road salt and wet weather while staying secure with drill-resistant locks.

What is the black finish like?

The aluminum diamond plate wears a glossy black ARMOR TUF powder coat for a rugged, blacked-out look, and the aluminum resists corrosion underneath. It hides grime a bit better than a bright finish and cleans up with mild soap and water.

How secure is it and how do the doors work?

The two side doors each open a 42" wide by 12-3/4" tall mouth into the 11.1ft³ interior for full sticks of trim and conduit. Each door uses a drill-resistant lock core with three-point latching, swings 90 to 180 degrees, and releases on tool-less QuickClips. The slim 13-1/4" profile keeps this long box light and low.

Is it made in the USA and under warranty?

Yes. The 390-5-02 is made in the USA and backed by a Weather Guard Limited Lifetime Warranty against defects in materials and workmanship.

What our customers say

5 · 1 review

HomeDepotCustomer Verified
07/18/2025

I love the accessibility these boxes give me. No more...

I love the accessibility these boxes give me. No more climbing in and out of the truck to get to my tools.