Db00,
There is a lot of merit to that though, but the big problem will be choosing what to take on. My simple advice (being possibly worth less than the cost) would be to (much as with cars) be certain what it is you are dealing with.
By large measure, RVs are a wooden frame with aluminum sheeting fastened on the outside. There in is the problem. When any water gets in an is not dealt with promptly, the frame rots. Repairs like this are never cost effective. They are restricted to those that are restoring for love only.
There are RVs that are an all metal or fiberglass structure. Those are a different game and demand different prices. You can hunt them up and not loose you ass in the restoration. Most of these also have a cult following that:
A - Makes marketing a restoration much more practical. And
B - Holds that lines prices above the rest.
Line be can be managed because the seller is often unaware of the existence of cult of ownership.
Good Luck
Matt