The TramBed features patented engineering innovations to solve the typical drawbacks of cantilevered truck bed extensions. TramBed is engineered for heavy-duty performance, designed from the beginning to be an invaluable aid to the contractor and commercial user. Even with a HEAVY LOAD the TramBed moves with ease in and out of your truck, rolling on eight sets of sealed bearings, over the internal track guides and onto the fully extended tracks. The load is supported by adjustable telescoping legs that enable TramBed to remain effective on uneven surfaces. There is no levering force like that produced by cantilever designs which require a heavy load to be "evenly distributed".