We bought a used 2011 cougar lite and its held up well. We travel all over the country. Only issue was a failed bearing and I fault the mechanic who greased them only months before.
Check your next potential RV for soft spots in ceiling and walls. Look for water staining inside. Open cabinet door and check for mold. Make sure everything works before you accept the keys. Axles aren't bent, tires have plenty of tread, outside caulking isn't missing anywhere. Check around all vents especially on the roof. There are plenty of videos on Utube to help you on your next purchase. Get educated and don't believe everything the salesperson says. Lots of luck.