WHY AN HPI™ Drop Door Semi Box
Highway Products boxes are completely reinforced to prevent the torsional forces that causes welds to crack and boxes to fail. The structure is the secret to our Million Mile Boxes.

You will never see bungies holding together an HPI Drop Door Box. Thanks to ¼” stainless steel hinges with 3/8” knuckle secured by torx screws. Stainless steel T-Handles with 3/8 locking rods.

We use 1/8” 5052 marine grade aluminum to ensure you won’t deal with rust or deterioration of your toolbox over the years on the road in all different conditions.

Upgrade from Smooth Aluminum to Polished Stainless Steel Doors, or even Powdercoat your boxes for a unique look

Perfect to mount under bodies, or use for a variety of applications.
Everything build at Highway Products gets our Lifetime Guarantee