Before anyone can really answer your questions ... you need to provide a little more information:
1) What's your budget for the truck & truck camper?
2) Where/how do you plan to travel i.e. mostly superslabs and paved roads or back country boondocking via forest roads etc?
3) Preference for new(ness) vs. used equipment?
4) Will you be towing anything behind you on this trip?
5) What's your level of maintenance/mechanical know-how?
As a guiding principle, you first acquire the truck camper that suits your needs, then match the truck to carry it.
