In 2010, we purchased a new Airstream TT (Thor by the way) and had nothing but problems and it was in for warranty work almost more than we used it. Then went to used Forest River Lexington that was a 2007, two owners, thought it was a good unit, only to find several problems that we paid a lot of money for. We thought that with low miles, it meant a good deal (Well other things considered also, not just mileage), and we were fooled. So then we decided to go the WInnebago route on the advice of several of our RVing friends….and so glad we did!! Bought a new Winnebago Aspect this year and have been so pleased with this unit…
I guess the moral to the story is no matter if its used or new, there may be problems and in our opinion, new means warranty as RV repairs can be costly. If you like a unit that you find, find another RV'r to go thru it and they may see things you don't.
Good luck in your endeavor and safe travels. Andi