I don't full time. But when I camp in my TT, I'm good for 7 days before the walls start closing in on me. If I were going to do this, I'd get a fifth wheel with opposing slides with rear living area. I'd get a diesel truck to pull it - most likely a SRW 3500. I'd concentrate an a fiver within that type of trucks capabilities, making sure it has a full size shower. I have been looking for a future purchase, and my favorite manufacturer at this point is Grand Design.
Take the advice to attend RV shows. Maybe purchase a used truck 1 - 2 years old.
Good luck.
