US Patent 9533623 Modifiable rack system

A modifiable rack system can be connected to a vehicle such as a truck or a tractor, and includes a receptacle for holding a variety of items including materials and equipment. The rack system includes a variety of add-ons for organizing and retaining equipment, and a hinged tail gate for easy access. The rack system includes a trailer hitch so a rolling trailer, or the like, can be daisy-chained off the back end. Wheels can be mounted to the rack system so the rack system can used as a rolling cart. The rack system is able to withstand large forces during use because of a tow support spine, and associated structures, which impart tremendous strength.