Welcome to the forum aRVowl!
When we purchased our current RV, with the intent to full time for a bit, I was nervous about places to park for downtimes.
We had only been weekend campers (for decades) up to this point.
While traveling and camping without the job and house to rush back too, was going to be a fabulous adventure, I knew there would be times we just wanted to chill out and enjoy an area for a season.
So...I logically thought a "MemberShip" would be a potential answer. I was fearful of finding ourselves parked at WalMarts, due to overcrowding at nice places.NOT!!!
Do what we did. Take a couple "trial camping" trips to a couple of the Membership parks you are researching. (We did RPI, Thousand Trails, and Coast to Coast.)
I am SO thankful we did our research. Really dodged a bullet!
All the marketing brochures and sweet sales talks, could not possibly cover the sad state of affairs for those Memberships.
(Now I am not talking about Good Sam, Triple A, or Passport America. There is a Big difference.)You do not need to plop down $3000, $5000, $10,000 to guarantee a place to play or rest for the winter, summer, or whatever!
And, there is NO RUSH. Ask for references, talk to others who are ACTUALLY camping. (Not just the sales team.)
Sorry for the mini rant. You cannot tell I get worked up over this, can you.