Good advice so far. Memberships in Coast to Coast, Thousand Trails, etc. only make sense if you use them. Passport America is cheap and you can recover your cost in 2 or 3 nights of camping.
We have been RVing for 32 years and full timed for 11. At one point we had all the memberships - - eventually dropped most of them as we no longer felt they were a benefit to us financially. We still have Thousand Trails, PA and Escapees. Overall, the memberships saved us a lot of money over the years - - but you have to use them - - and you may find yourself planning your travels around where the membership campgrounds are - - which may be a good or bad thing depending on your point of view.