In 2013 we purchased our 2005 American Tradition with 62K miles. On the surface the coach was well maintained with complete service records. Since the purchase we have replaced the shocks and tires, transmission control module, refrigerator, water pump and the front A/C, all under extended warranty. We've had a couple of leaks due to inept roof maintenance by the previous owner, but they are all repaired properly now by me. We now have 92K miles on it and the mileage has increased by 1 mpg. Would I buy another well maintained used moderate to high mileage Coach? Yes, in a heartbeat.
If you decide on a used coach, be prepared to perform your own repairs whenever you can. If you have a chassis or engine problem, go to the aproprietary factory reps unless you can get a good recommendation for a good repair facility. If you need work done on the coach, find a good small shop that can do the work xorrectly.