Lo-side truck boxes mount along the bed rail like hi-side boxes but sit lower, keeping your rear sight lines clear and leaving room for taller cargo, rack systems, or equipment in the center of the bed. If you use a truck rack, haul tall equipment, or just want better rearward visibility while keeping tool storage in the bed, lo-side boxes give you organized, lockable storage without getting in the way. We carry lo-side boxes from trusted brands in aluminum and steel.
Lower Profile, Better Clearance
The main advantage of a lo-side box over a hi-side box is height. Because lo-side boxes sit closer to the bed floor rather than at the top of the rail, they don't obstruct your rear view when checking mirrors or backing up. They also leave clearance above them for equipment, rack crossbars, or taller items that a full-height hi-side box would block.
Lo-side boxes are a natural fit for tradespeople who run a rack system over the bed — the lower-profile box sits underneath without interfering with the rack or the loads it carries. Like hi-side boxes, they mount to the bed wall and leave the full center of the bed open for cargo.
Organized Storage That Works With Your Setup
Because lo-side boxes are shorter than hi-side boxes, they hold less interior volume. They're best suited for a focused set of frequently used tools, not a full day's mixed load. Think of them as secure, organized storage for what you reach for most, while the rest of your load rides in the open bed or on the rack above.
Better Built and WeatherGuard build their lo-side boxes from heavy-duty aluminum and steel with the same weather-seal compression latches, gas spring lid support, and corrosion-resistant finishes found across their full truck storage lineup.
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Frequently Asked Questions
A lo-side box mounts along the truck bed rail at a lower profile than a hi-side box. It sits closer to the bed floor, keeping sight lines clear and allowing clearance for rack systems or taller cargo above.
Both mount along the bed rail. Hi-side boxes sit at the full height of the rail; lo-side boxes are shorter and sit lower, giving you better rear visibility and more clearance above the box.
Yes. Lo-side boxes are designed to work under most truck rack systems, sitting below the rack without interfering with it. Always check height clearance between the box and your specific rack.
Compatibility depends on the specific box and cover combination. Check individual product pages and your tonneau cover manufacturer's compatibility guide before purchasing.