I purchased a Class A DP a few years back, which was 2 years old. I bought the top of the line independent warranty package that I could get - about $4000. It was truly worth it. I am ahead about $10,000. If you buy used, lock in your maintenance costs when you buy with a 3 or 4 or 5 year warranty. Yes, it seems expensive up front, but compared to the difference in cost of buying new, it is cheap. $3000 or $4000 seems cheap when you are looking at replacing a gen set, or a transmission, or motor, fridge, etc. It buys you peace of mind, and fixes the costs. That's what insurance is all about - spread the costs.