I saw a REALLY long suburban at Checkers one day and was looking at it when the owner came out an showed me what he had done to make it. He took a large Ryder moving van put a widened and stretched suburban body on it, then he added a stretched (to 12 feet) and widened dually truck bed on back of the suburban and blended the two together. He used it as a custom car hauler for auto shows. It was way cool but quite impractical as he had to park lengthwise in the parking lot so he didn't block access to the whole parking lot.