Before deciding to join a "club", check which campgrounds along the way offer this club discount. I've seen some great rates at RV parks posted by Passport America members, but a small subset of parks accept the club. Sometimes, it's the same rate as AAA or AARP. Paying with a credit card that has a cash reward program is an added perk.
If you will be doing national parks, you should get a gezzer pass.
Welcome to the forum. We retired last year and did a 16 state, 6 month, 6000 mile tour of the southeast. We had a ball.
Jerry & Jeanne
1996 Safari Sahara 3530 - 'White Tiger'
CAT 3126/Allison 6 speed/Magnum Chassis
2014 Equinox AWD / Blue Ox