You need to consider stopping, going up long hills and going down long hills, not just pulling and . It sounds like you want to travel far and wide. You may be better off with a used oil burner with 10 years left in her. Ask yourself how long the truck will last pulling that trailer. (I think the FB is all the right stuff as a design). Then you are looking at another TV in 3 years or so.
I pull a 1959
26 footer with a 2005 Duramax / Allison 2500HD Crewcab. Do I have power to spare, yes. That's a problem.....??? I cann't wait to get on some real mountains going up or down.. This truck will last 15 years and I can just go where I want with worry about elevation, mountain passes, ect.