How used is too used?

I agree with most of the comments already stated. One issue that hasn't been brought up is your assessment of the seller and how he presents himself. Does he care much about little details of the rv like stains on the carpet, is there cooked on food and crumbs on the stove? What does his house, garage and other vehicles look like? Does he have pets that he takes with him in the rv? You may not care about the pet issue but I do because I'm allergic to pet dander and have a very keen sense of smell. I'll sum it all up by saying you would never have to worry about buying any rv from me no matter how old nor how many miles it has on the speedometer. I take care of my vehicles because I don't ever want to be stranded on the side of the road if I can help it at all.