Thanks for the comments. We were using a 2012 F250 with 6.7 to haul our Palomino HS 2902 single slide that had a shipping weight of 3261 lb. We usually travelled with the fresh tank full as well (45 gallons). The F250 hauled around this camper great especially in the high elevation areas which we spend alot of time. When we take our V10 Excursion out there it seems to struggle in the mountains. We have the new Ford 7.3 in a Class C but have not taken it out that way so I am not sure how it would do in the mountains. I was just hoping I could get a F350/3500 to do as good a job with the Host SB as the F250 did with the Palomino. I have had multiple DRW trucks before and we go places without the camper that is too tight with DRW. Which is one reason I want to stay away from DRW if possible. I still have not ruled out a gasser but would rather go diesel if the extra weight is not an issue.