I am looking to buy a new 5th wheel and I need to buy a new truck for it. I am either looking at a RAM 2500 or RAM 3500. I am looking to buy it with a diesel engine. The specs for the trailer say the dry hitch weight is 2,605 lbs and the GVWR that includes cargo is around 15k lbs. I would like to buy the 2500 since it has coil springs and probably a better ride. The cost of the 3500 is less than $2K so I don't think that is a show stopper. My concern is that I am at the border line of the towing capacity of the 2500 and should I move up the 3500. The next question I have is if I do move up the the 3500 will the ride be noticeable stiffer than the 2500. If I went to the 3500 would the auto air leveling system improve the ride of the 3500.