Dandy Dan wrote:
Mike, there is a post on I think "tow vehicle" on the 6.4 If I get the name right it is IB516. He has went from a diesel to the 6.4 Dodge and seems to like it quite well. You may be able to get some good info from his posts. I think the new Dodge 2500 has coil springs but not sure about the 3500. The only thing I would really check is bed height differential between the 18's and the 20's. Good Luck in your venture. Wish it was me getting the new 6.4 You actually get more payload with the 6.4 over the 6.7 diesel.
The "payload" is irrelevant because with a 5th wheel virtually all the weight is placed on the rear axle. Engine weight mostly changes the front axle weight.
Example with my nearly 5K pin weight I add less than 200# to the front axle.
The truck will probably be fine for the 5er mentioned but personally I would buy the Cummins. It will pay back when time to sell and you might as well enjoy driving it for the 4 years you say you will own it.
