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

We have almost the same as sdianel and would give the same advice. We don't have KOA, have only stayed at 2 of their parks in 8 years of fulltiming. They are always overpriced for what you get. We use Passport America first, then Good Sam. We also stay at casinos, Cabela's and some city/county parks listed in Don Wright's Free Campgrounds books, they are mostly low cost parks.