Tom:
Here's a data point. We owned an '02 Georgetown 32-footer for the last 4 years. It had 12,000 miles on it when we bought it from the original owners. We used it for three seasons and put an additional 6000 miles on it. It was on an F53 chassis with the V-10 and had a 5.5 KVA Onan generator which had 48 hours on it when we bought it an about 70 when we sold it.
We hadn't used it at all in the 2014 season, except as auxiliary sleeping quarters when family cam over from the UK and Japan, so we decided to give up the lifestyle. It sold for just under $24,000 with a local consignment dealer.