CAD designed chassis modeled by a tenured mechanical engineer, and assembled by a tenured fabricator . It was designed to be a fully enclosed race\chase prerunner It's built around a 07+ Chevy x-cab that is included . 4130 Chassis is a center pivot with rails the tube structure is built off, extremely long lasting and rigid design. Engine\shock mount cross brace included. Built around 42" tires and a 454 lsx and associated power-train components. Can been seen in Henderson Nv at 4 The Truck Customs.