Sounds like you are looking for a group where you can have social interaction rather than an RV club / group that specializes in product purchases.
There are lots of specific RV clubs, but you'll find most of them are RV specific based on the brand or model you have (for example AirStream or Jayco only). And of course, their "socializing" occurs when camping. So, usually, over the internet, they inform their members when and where their next gathering is, and then take reservations. Outside of the actual campground, there isn't a whole lot of interaction. Now, granted, there are some exceptions I'm sure. But mostly, that's the way they work.
One of those exceptions is an RV club specifically for women. No men, no kids, no pets.... But oh my goodness, are they a fantastic group with groups that gather all over the USA. They are called,
Sisters on the fly If nothing else, take a look at their website and browse through their photos of vintage "girlie" painted campers! They are absolutely awesome! I really love this organization. They are so unique. But I can never join ... I'm a guy!