If you Google "campground clubs", and then skip past the hits for individual clubs, you will find a few overviews and summaries. For example, a site called RV Lifestyle Experts seems to have a number of articles, including
http://www.rvlifestyleexperts.com/fr...ship-rv-parks/
But there are several others. It is worth it to go through several, not just the one I linked.
Bill