Have not joined PPA yet, but done lots of research. It depends on the campground. We are planning on on a long trip throught Tx, NM, and Az this coming Feb and March and plan on joining PPA. I've found that lots of PPA parks will not honor the 50% discount during prime season, but will offer a smaller PPA discount during that time. Usually better than the run of the mill 10% Good Sam, FMCA, Senior Citizen discounts. But you have to follow the specific rules for each park in order to get a discount of any kind! Some want you to make a reservation stating PassPort America and some don't. If you can follow the rules, you have it made!