Ray,
I thought at one time about purchasing a campground membership, but I decided against it. I started checking into monthly rates at really nice campgrounds and found that they weren't high at all.
Buckhorn for instance, is about $460/month plus utilities and Seibt RV in Parumph, NV is about $489/month, Tiger Run in Breckenridge is around $1164/month, and Indio is $1600/month. These are all first class RV resorts. True the last two are pricey but the first two are really bargins, IMO.
The advantage/disadvantage (depending on your perspective) here is that you are staying for a month in one place but you don't have to maintain a membership. No initial cost going in, no yearly fees, and nothing to sell plus you pick the finest RV resorts in the country not some marginal CG! Win-Win.
IMO, monthly rates are the only way to go for a full timer.
I dream about full timing but Louise wouldn't go for it!
Again, you get what you pay for!
Just my .02
Tuga & Karen Gaidry
2012 Honda Pilot