We belong to several national RV clubs, as well as chapters and special interest groups within those clubs, and smaller specialized independent groups.  The major ones are:

FMCA – The Family Motor Coach Association was founded in 1963 by a group of people with owner built motorhomes, many of them converted buses.  Membership in FMCA is by family rather than individual and each family is assigned an F#.  The F#s are assigned sequentially, and are never reused with the exception that a Son or Daughter can keep an F# that belonged to their parents and add an ‘S’ or a ‘D’ at the end.  Membership in FMCA has always been restricted to families who own at least a 1/3rd interest in a motorhome in which it is possible to walk (not crawl) from the cockpit to the living area.  Basically, that means Class A, B, C, and D motorhomes (no towables, truck campers, or tents).  As of September 2013 the F#s have passed 430,000.  Of those F#s, about 80,000 are actually active, representing approximately 160,000 individuals.  FMCA is organized into 11 areas, 10 geographic and one non-geographic (the International or INTO area).  FMCA has many chapters (special interest groups) and we have belonged to several over the years.  FMCA eventually opened its membership to owners of towable RVs, and ultimately changed the name of the organization to reflect this change.

SKPs – The Escapees RV Club was founded by Kay and Joe Petersen as a support group for people who were living in their RVs full-time but has grown over the years to be a significant RV organization.  The emphasis, however, remained on full- and extended-time RVers and the SKPs run the largest private mail-forwarding service in the U.S.  It even has its own ZIP code!  The SKPs have state chapters as well as special interest groups known as Birds Of a Feather (BOFs).  We have belonged to one chapter and several BOFs over the years:

Airstream Club International (Wally Byam Caravan Club Intl)