RV
We retired early to enjoy RV travel. DW had never experienced an RV. We learned that several KOA campgrounds have Airstream travel trailers for rent on location (no towing). We rented one for a few days and she liked it.
When purchasing we looked at all options except pop-ups. Class A,B,C motorhomes, 5th wheels, and traditional travel trailers. After reading some of the maintenance issues with motorhomes, and preferring something smaller than the 5th wheels with slides, we elected truck and trailer. The next steps was new versus used, brand, size/floorplan.
All RV's depreciate and many of the "box" type RV's have a lifespan of 10 years or less due to leaks and cheap construction. After reading Airforums.com, a very active Airstream online forum, for over a year we decided to buy a 5-6 year old well maintained Airstream. We found one on eBay that had been used only 5 times. So far we are pleased. We avoided the steep early depreciation. Airstreams are built to last and there is a strong resale market. Many 50 year old Airstreams are still on the road. We've met several Airstreamers who buy the older units, fix them up, use them a while, then sell and start again. Like all RV's they can leak if not maintained.
After a little more than a year of ownership we love the lifestyle. We attend rallies organized on Airforums. We also joined WBCCI, the national Airstream club and go camping occasionally with the local chapter. Of course many trips are on our own. Airforums.com provides a great source for support and research when problems develop. After some initial repair work (seams and new tires) we've had a relatively trouble free experience.
If you are considering buying an RV spend a few weeks reading some of the brand forums as well as the forums on RV.net. Consider renting a unit for a few days to determine if you can live in the small space.