I went from a F150, 5.4 3.73 rear end to a 2008 F250 6.4 Extended Cab and then back to a 2500HD 6.0 gas.
When my wife and I picked up our first travel trailer we didn't like the stability of the half ton so we picked up the F250 with the 6.4. The first winter I had constant check engine lights on cold starts in the winter. The diesel was great when we had our travel trailer but then we sold that and decided to look into a truck camper. The F250 only had 1800lbs of payload per the door jam, so we traded it across the board for the current truck in my sig with 29xxlbs of payload per the door.
If the truck had more payload and honestly no check engine lights with cold starts I might have kept that truck.
Maintanance on the 6.4 cost's a lot more than my 6.0 Gas truck. I was doing oil changes every 7500 miles and fuel filters every 15k to avoid oil dillution. The 6.4 got the same mileage as my 6.0 gas unloaded same route to work so no gain there. I bought these trucks expecting it to burn fuel so it didn't really bug me, just surprised by some of the claims.
If I were to purchase a 8,000lb+ GVWR travel trailer / fifth wheel then I would be looking for a diesel, having owned both I can say from experience there is a point where the diesel just works better. However if I did go back to a diesel I would take my time and try to find a pre-dpf duramax or cummins.
