op wrote:
My main concern is will I regret not getting a dually. If I must have a dually the plan to buy a 5th wheeler will probably be scrapped.
Depends on how much loaded pin weight a 33'-35' trailer has. The 6.7 diesel will have no problems pulling those size trailer....but the truck rawr which carries the load is limited.
Match the size truck you need to estimated hitch weight from its gvwr not a length number.
33'-35' rv trailers loaded hitch weight vary greatly in trailers this length.
As MFL and ford truck guy points out some 5th wheel trailer that size may have too much hitch weight plus other stuff in the trucks bed and rear of the cab may over load a F350 SRW 7250 rawr/tires/wheels and rear suspension.
The most weigh a 7250 rawr F350 srw can carry will be in the 3600-3800 lb range depending on truck options.
Choose a lighter gvwr trailer and the F350 srw will be good to go.