Do LOTS of research. I joined or lurked on several owner forums of specific brands I was thinking about and searched for reviews & problems on brands I didn't know. I talked to owners at RV parks and finally decided on what we wanted. We bought a used 5th wheel and had no problems with it. We "upsized" to the same brand last year and have been happy. Like I said, here's a TON of information on the web, make good use of it.
2004.5 GMC SLT CCLB, Ride Rites, Turbo brake, EFI Live
2012 Arctic Fox 29 5T 5th Airborne, B&W, Prodigy
Papillon navigators Lily, Buddy and Willow