When we fulltimed, we had a Campground Membership with gated entrance.. We stayed several months each year there.. Few others stayed year-round but was required to move to a different site in the park every so often.. No RV could be set up permanently on a site..
We paid $800 for the membership and $240 was the annual dues.. The annual fee included 35/days use.. After that period of time, if we wanted to stay longer, it would cost approx. $10.50/day or just over 300/month and included full hookups, elec was included in that price..
When we decided we no longer wanted the membership, sold it on craigslist after using it approx. dozen years... We had the option to sell it, give it away, or just give it back to the park.. The Home park is owned by the Members.. It has been in business over 30 years and carries no debt..
Paid for itself several time over when other parks we charging approx $20/day..
The membership also affiliated with C2C, RPI, and ROD.. We joined C2C which cost $79/annual, and that gave us approx. 300 affiliated parks to use for $10/day up to a week at a time..
There are Memberships out there, just takes a little time to find one that may fit your requirements..
There are also places where you can buy a lot in Parks..
Good luck on your adventures...