We also use KOA, Good Sam and Passport America. We easily get our investment plus back on all 3 each year. We like staying at KOA and build up points. We built up enough points last year to earn 2 "free" nights at the Bar Harbor/Oceanside KOA in Maine. I also like Passport America, however the campgrounds that accept it have a lot of restrictions. But you can always depend on Good Sam to get $10 off per night pretty much everywhere. We are heading our for a 10 week trip in June. Our first 14 days are, 5 nights in KOA's, 4 nights in Passport America campgrounds and 5 Good Sams.