Just curious about "Passport America"

I found that the parks offering Passport America discounts for only a certain number of days or not allowing holidays would still give the discounts for the qualifying portion of my stay. That often ended with the average price still being cheaper than parks not offering PA. If you use commercial or private RV parks it will pay for itself in one or two stays. If you travel during the "off" season, you may find the discounts being given to you without regard to stated limitations.