Here's one of the many threads on this site, about Thousand Trails.
Thousand Trails zone membership
I had a zone pass for two years. The first year I got "free" when I bought a new MH in Mar. 2013. I only used it once, a month or so before it expired. The park I used it at wasn't bad (TT in Clermont Fl). The rate to renew was $500 something or other, which wasn't worth it to me. I'm retired (just over 5 years now), but my wife is still working (she retires Nov 30). They offered me a one year renewal at $199, which I did buy. I used it about twelve nights, I think it was. I went to the Clermont park (3? more times) and once to another park on the Peace River in Wauchulla Fl. I believe there are only 3 TT parks, in the whole state of Fl.
My membership expired in June and there was no mention of a discounted renewal rate. so I let the membership lapse.