Winnebago is one of the major manufacturers of motorhomes. They sponsor a club for owners of Winnebago-manufactured RVs. The club runs rallies and tours for members. Here is a link to the Winnebago Industries main web page: Winnebago Inc
Good Sam is an RV club that offers discounts on many RV services such as camp grounds and insurance. They also run Samborees (rallies) and tours (caravans) for members. Here is a link to the Good Sam Club: Good Sam
The Family RV Association (formerly Family Motor Coach Association) is a club dedicated specifically to motorhome owners, but has since expanded its scope. Here is a link to their URL: FMCA/FRVA