If one is meticulous about preventative maintenance then an RV can last well past 10 years. My guess is however, that most owners are not. At 10 years the roof is ready for a reseal/replacement and the running gear is shot too if it still has the original shackles and bushings. Probably a lot of rust too. Today's built RV's are even worse than those built 10 years ago as more price cutting has taken place and the build quality is certainly not there as it once was(and that's saying a lot as build quality on the average RV was never great to being with).