Just thought I'd add a thought: I towed for a number of years with a 2002 Yukon XL 2WD with 3.73 gears and a 6700 pound (on a scale) trailer. That vehicle was the best vehicle purchase I ever made. I towed in California, up and down mountains, and really had no trouble. There are 2 areas of concern I would point out. First is that the stock hitch is garbage. I replaced mine with a Curt. Bolt on, inexpensive, strong. Second is that my rear axle had too much weight (tongue was about 1000 lbs) and the back brakes overheated a couple of times on longer downhill curvy roads. However, I learned I was descending in too high of a gear (3rd once and 2nd another time). But that overheating was a gnawing problem for me. I replaced that Yukon with a 3/4 ton Yukon 8.1. I also go downhill on mountain roads (Big Bear, CA) in first gear now which works very well. I would have kept the half ton if I still needed a daily driver (the 3/4 ton ride is rough), but now I only tow and bring home furniture the wife keeps buying. Seems I alternate between camping and toting furniture every other weekend, but that is a problem for a different forum. Enjoy your camping!
Andre