I would be very comfortable buying a well maintained 2001 TT. There are only a few manufacturers of certain components such as the furnace, a/c, stove, etc and all can be replaced with current units. The same goes for brakes, wheel bearings, and chassis parts. Most of the plumbing and electrical wiring and lights can be found at places like Home Depot and auto parts stores. You can source carpeting, cabinet parts and furniture easily, too. The biggest fear on a used unit is water intrusion. Small roof or window leaks can cause catastrophic damage causing rot and delamination. Carefull