heres my input, we have a 27 Fleetwood with the big slide at about 6000to 6500 ready to camp I tow with a 2010 gmc 1/2 ton crew cab short box with the 53 and the tow package. I have no problems what so ever, I can go up any hill at 70 mph or more if needed. I can go down 4 mile steep down grades at a steady 55 and almost never touch my brakes. i can tow at 70mph if needed and very stable. I get 12 - 15 towing depending on terrain and 23 not towing hi-way. the truck sets a little lower than the 3/4 ton and rides smoother, i'm older now and done with having to clime into the cab. its an every day driver for us and we use it a lot for traveling not towing. your most likely going to be 6000 or under with a 25ft. trailer. think about the big picture what your going to generally use the truck for.
Jay D.