Jake and family! Before we found our GeezerEgg, we van-camped and were the King & Queen of the KOA system. KOA's are lovely campgrounds, but recently they have gotten too spendy for our budget. We can only speak about one discount program. We have belonged to Passport America for several years, and have been pleased with the member-campgrounds and rates. We've had a couple of less-than-satisfactory experiences, but overall, we like using this membership. There is a similar group - Happy Campers - don't know anything specific about that one.
Whether or not a discount club is right for you will depend on the kind of camping you choose. We often prefer camping in state/county/national parks, where we frequently use our Golden Age pass. If you prefer "resort" type RV parks, a discount club might pay off. Whatever you choose, we wish you safe travels and many, many happy memories. Take care, L 'n D