In 9 years of fulltiming, we never felt the need to join a club.
We did buy a lot in the community where our elderly parents lived. There were no decent campgrounds or parks there. We needed that lot when we went thru illness and death of 3 of the 4. It served us well and we sold it for more than we paid in the bad market of 2009.
I suggest you give it a year on the road to see where and how you like to travel, then make the choice. It would be a terrible thing to buy and find you really don't care for what it offers, knowing that you have to spend x amount of days to make it pay.