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As usual, it depends. The dealer where I bought my 'C' new, backed the manufacturer's warranty because they also have repair facilities on site. And even though the warranty has expired, they still do maintenance and repairs as needed at a discount. On my last visit, I was comfortable asking them to start at the rear bumper and work their way to the front bumper inside and out. There wasn't much to be repaired or replaced and they added a TPMS system at my request. I still got out for under $2,000 on a 10 year old RV.
I'm sure part of the longevity comes from the fact that its stored in a heated garage when I'm not on the road. And I own the garage, so no rent.