Let's back up a bit and ask what your are looking for in an "rv club". Social life, park discounts, pre-planned places to go, etc. There are "clubs" for all of those, and some that do multiples of those to some degree.
Generally, newcomers should not rush into any RV club, regardless of the advertising. Certainly make no long term commitments, so only consider those with low cost annual memberships, e.g. Passport America (park discounts) or Good Sam (a collage of social events and discounts). RVing is a lifestyle and you don't want to get roped into a long term contract until you have established when, where and how often you will RV.
Here are a few articles that may help you:
https://www.roverpass.com/blog/rv-clubs/
https://www.frugal-rv-travel.com/RV-Membership-Clubs.html
https://campaddict.com/discount-camping-rv-clubs/