You are talking about the Elite Suites GVWR that is 20,000 dry weight 15,100. But we do not have an Elite Suite. Ours is Mobile Suite TK3. GVWR is 17,500 Dry Weight is 13,200. We are attending the Rally and have an opportunity to weigh the truck and the trailer separately and together. There will be no guess work there. If we find that we are wrong, then we will get another truck. By all means we want to be safe. When buying a truck give it a test drive and have it weighed somewhere. Then you know you are okay. Right now we think we are. If I were David I would do what you suggest buy the 450 if he is looking at the 38ft suites or the Elite 36ft.