I am going to assume that you are going to full time and travel, even though you may elect to sit in one warm place for most of the winter.
Big frig, shower, all those comfort items are good suggestions. Even though there will still be some adjustments living in less than 400 square feet 24/7.
I would either buy a used FW (1 - 3 years old) or a new one. I would stay between 38' and 40'. Find a floor plan that you really like and go with it.
Learn how to calculate your weights, truck, FW, and combination. DO NOT go by what any RV sales person tells you! Plan on adding between 1600 and 2500 pounds of extra weight as full timers to your TV and FW, so match the TV accordingly.
The only way you are going to know if your FW has the correctly rated tires on it, no matter if they are brand new out of the factory or not, is to either weigh the unit loaded or do some figuring yourself. 80% of the FW sold new do not have the properly rated tires.
Tires and weight ratings, and making sure you have enough truck to pull a full timing FW are the most important safety issues.
Do you want to be like some of us that never have flat tires or break downs, or do you want to be that guy that saved a few bucks and ends up on the side of the road waiting for the wrecker twice a year?
