which card to get AAA, Good Sam, KOA, RV America

Passport America gives a 50% discount and the cost of membership can be returned with just two nights stay. The campgrounds we've stayed at were not destination type cg's, but were clean and good enough for a stopover. You need to be careful on the restrictions (time of year, days of the week, # of nts allowed) but I think the membership is worth it. Camp on!