Most everyone agrees that Passport America is a good deal. You only need to use the membership a couple of times for it to pay for itself. There are many restrictions, though, on specific campgrounds so you need to do a bit of research on the PPA website.
http://www.passportamerica.com/Some of our favorite campgrounds are the Army Corps of Engineers campgrounds and they are generally priced right. Of course, National Parks are great destinations for RVers. Many of them only provide dry camping, but they put you right where you want to be. If you are over 62, but sure to get an America the Beautiful pass to use for both Admission and discount camping at these parks.
https://store.usgs.gov/pass/senior.htmlSome campgrounds offer good discounts to Escapees members but you don't really join Escapees for the discounts. This organization is the go-to place for information on fulltiming. They offer a great mailing service and are always on the front lines when it comes to RV advocacy.
https://www.escapees.com/Then, there's Thousand Trails. If the "preserves" work for you and if you use them, say 50 nights or more a year, TT is a really good deal. If you don't like them or don't use them, well, of course they're a poor investment. Still, many fulltimers say that they couldn't afford to be out there if it wasn't for TT.
https://www.thousandtrails.com/Beyond all that, many people love workcamping and volunteering for a campsite. You can get "free parking" and even make a modest salary if you are willing to trade hours worked for the savings/income.
-G.R. "Scott" Cundiff
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Here and There Blog
2005 Safari Cheetah 38PDQ
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We've visited them all (but not always with the RV)