Commercial Trucking Underbody Boxes Constructed with .100"" heavy duty diamond plated tread aluminum, Commercial Trucking Underbody boxes can be mounted as a traditional underbody box or secured topside to the trailer frame or deck. The oversized stainless steel, locking flush mount T-handles provide the ultimate in security, while weather proof gaskets seal keep dirt and moisture out. Commercial Trucking In-Frame Boxes Designed to be mounted between frame and truck rails, In-frame commercial truck boxes conveniently store heavy chains, binders, tie-down straps, and other equipment within easy reach. Constructed with the same materials used in our Commercial Underbody boxes, the In-frame boxes offer the option of a padlock or locking T-handle configuration. Available in brite heavy duty diamond tread aluminum design.