Please see list of RV Clubs in Australia for those who may be interested in joining clubs, either National or State;

http://www.caravanning-oz.com/Caravan_Clubs.html 

Over the years and with different RV's I have found in general it is better to join a generic club (any type and make of RV) than a club for a specific type or make of vehicle.

Reason being, is you can spend years in a specific type or make of club making great friendships but at some time may change your type or make of RV for one reason or another and because of the constitution of a particular club find you can no longer belong to it or attend rallies. 

Clubs are not for everyone, but for those enjoying the kinship and social life of clubs they can be a good experience and a good learning curve for RV's in general.