Hi-side truck boxes mount along the top of the bed rail on one or both sides of the truck, leaving the entire center of the bed open for longer cargo, equipment, and materials. We carry hi-side truck boxes from leading brands in aluminum and steel, available as single-side or paired configurations for most full-size and mid-size trucks.
Rail-Mounted Storage That Leaves the Center Open
Hi-side boxes take advantage of the narrow strip of space along the inside of the bed rail — an area that's usually wasted when you're hauling large materials in the center of the bed. Because they mount high and to the sides, the full floor and center of the bed stays completely clear. This makes hi-side boxes the go-to choice for plumbers, electricians, HVAC techs, and general contractors who regularly carry long stock alongside a full set of tools.
A single hi-side box on the driver's side gives you curbside access to your tools without walking around the truck. A matched pair on both sides doubles your storage capacity while keeping the full center open. Lids open upward on a gas spring or stay arm, holding open hands-free while you load and unload.
Built for Daily Outdoor Use
Hi-side boxes from Better Built and WeatherGuard are built from the same heavy-duty aluminum and steel used across their full truck box lineup, designed to handle road vibration, weather exposure, and daily loading without wearing out. Weather-seal compression latches keep the interior dry and protected. Lock mechanisms secure the lid when the truck is parked.
Because hi-side boxes are narrower than crossover boxes, they hold less total volume, so they work best for a focused kit of frequently used tools rather than an entire day's load.
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Frequently Asked Questions
A hi-side box mounts along the top of the bed rail on one or both sides of the truck. It runs along the interior wall and leaves the center of the bed completely open for cargo.
A crossover box spans the full width of the bed at the cab end. A hi-side box mounts to one or both side rails without crossing the bed — leaving the center open for longer or larger cargo.
\Yes. Most hi-side boxes are sold individually so you can install one on a single side or purchase two for both sides. Some models are also sold as matched pairs.
No. Hi-side boxes are narrower and typically hold less volume. They work best for a focused kit of tools rather than an entire day's load.