Hi everyone, I'm looking for a few different type of truck back set ups. Would be interested in aluminum cargo boxes, flat decks, dump boxes, etc. Let me know what you have. I have a Dodge 4500 cab and chassis I would like to out fit, it has a 12.5 ft behind the cab to the back of the frame. I also have a GMC c7500 cab and chassis I would like to out fit, it has a 12.5 ft behind the cab to the back of the frame.