Here's the list of good 4 season RV's:
Just about any middle to upper level 5th Wheel will give you good quality. If I were going to stay in a RV Park or Mobile Home Park (trailer park) full-time I would look for a used RV on the list. That way you wouldn't have to take as big of hit on depreciation when you were ready to sell. If you aren't worried about towing weight I would look for one with at least 3 slides (more room).