Camp Club USA, PassPort America and other very similar products offer discounts off standard rates for selected campgrounds (usually not affiliated with major groups, AOR, CCC etc) that have many restrictions. Normally NOT available weekends, holidays, peak season etc. If you travel alot without planning stops and need a place to park during the week they can save you some money. You would have to plan several trips specifically to these campgounds over the course of the year to realize a return on your investment. We tried PassPort America for several years and couldn't make it work, and for the most part were not happy with most of the parks.
Daniel & Donna Leonard
2011 Ram 4500 SLT 4x4