We shall see when the time comes. RickJay has hit on it pretty good I think. Bottom line. It depends. Depends on lots of things. Not the least of which is are we starting with a well respected builder? Alpenlite was a well respected builder in its day. Ours has many miles & many nights on it. A bad thing. However the seven months each year when it is not in use it has had full indoor storage. A good thing. Also it gets its roof reconditioned twice a year, sides & rear cap waxed once a year & the front cap, looking almost fresh out of the mold gets a light compounding & a waxing with nothing but the finest marine wax 3 times a year. It is a late 2007 but I have seen neglected 2-3 year old units looking far more aged.
We shall see. It all depends on who comes sniffing when the time comes.