I have read a zillion different articles on what size truck is needed for 5th wheel campers. As stated in a previous post I just purchased a grand design reflection which has a dry weight of around 8600 lbs. It's 33' 11' Wanted to keep the length below 35 for storage purposes. I'm crunching the specs on the 2500 and 3500 duramax for a puller. The trailer is well within the capabilities of the 2500 but I sure feel better if I get a 3500 dually. I'm going to drag this trailer through the Canadian rockies next year and then down to the Rockies in the US. The following year am planning a trip to Alaska. My wife doesn't want a dually but in the end it's my decision as she decided on the camper. Should be fair enough I would think. Another question, what about the single rear wheel 3500? On my trailer is it light enough to have a 3500 with just a SRW? Thanks!