I would shoot for a 3/4 ton truck of whatever brand. Since you don't have a TV for it currently, that suggests it has been sitting or set up at a campground.
Just in case you haven't considered it, you need to make sure the TT tires and brakes are up to snuff for such a long trip.
So, the real question is, are you going to spend more on getting a TV, possible TT tires/service axles/brakes than you would spend on getting a TV that up till this point you haven't needed?
Just throwing that out there. I would have the TT axles and bearing redone, and check date codes on tires and such.
Good luck!
