I bought a 10 year old coach from a dealer. I paid $5,000 for a 3 year 36,000 mile extended warranty. It covers the electrical, engine, tranny, awning, appliances etc. It does not cover maintenance items (brakes, tires, belts). In my situation, not knowing how things were taken care of and or serviced prior to my owning the coach......I felt this to be a good investment. I would have hated to have left the dealer, gone down the road and then have to pull into Cummins for a new motor and have that come out of my pocket.
I think one has to examine his own exposure and figure out the best bang for the buck.