I REALLY appreciate all the replies, you guys are great !! I'm guessing my owners manual will have my front and rear axle weight rating ? The door sticker says max payload is 1620LBS. I never thought about options and their effect on payload capacity (crew cab vs reg cab, 6.5 ft bed vs 8 ft, etc). I can't say I'm very impressed with pop-ups as I would use this for archery and rifle hunting and would like something to keep me warm (well insulated). I've got SOOO much to learn about this whole deal, maybe it's better to just wait and start fresh with my next truck purchase. I knew the Lance 650 would be close weight-wise, but thought with timbrens installed maybe.......Also I was curious how long a tank of propane lasts you guys out in the cold (for running the heater) ?