irv2 is a great place to start. This forum is full of helpful RV'ers and you can post inquiries about almost any topic and get really good information from the members.
The following site is all about people and their classic/vintage RV's. Many restorations are shown as well as resources for help/supplies.
Good Old RVs
Ad (N6GLL) & Tommi 2002 Ford F250 TD 4X4
1997 Newmar American Star XL 30RKCL
My other RV 1963 Cascade 29 Sloop