Mileage is less of a consideration, high OR low than overall maintenance, and the records that will prove it. Our coach had 112k miles on it when we purchased it in April. It now has 119k on it and has run flawlessly. Most extended warranty plans have a cutoff of 80k miles for starting the plan, and they generally cut you off once your coach reaches another, higher, mileage, usually between 125k and 150k, but given the difficulty a LOT of people have getting their warranty company to pay, we feel pretty comfortable without having an extended warranty. Would I have purchased one if one had been available? Possibly, but only after reading the fine print and speaking with people who have had warranty claims with that company.
Bottom line, inspect, Inspect, INSPECT prior to purchasing, an oil analysis of major components isn't necessarily out of line either, and then maintain, Maintain, MAINTAIN, in accordance with manufacturer, best industry practices are your best bet. If you can do the work yourself, even better, that way you will be more likely to spot BS coming out of the mouth of repair people if outside work is needed.
Scot & Laura Kellersberger
2001 Newmar 4 wheel drive Dutch Star 3891, 2005 GMC Canyon. Demco Tow Bar & Baseplate U.S.Army (ret) 1985 - 2006