I would advise that you don't contractually obligate yourself before you've been on the road a while and see how you like to camp. Also, everyone's money situation is different, so take that into account when you see advice here.
fwiw, we've gotten good value from Passport America, but stays are almost always limited to a couple of nights at their CGs before going full rate. Our friends that got us into this did Escapees while fulltiming before health issues grounded them. Also, most CGs offer senior and AAA discounts. Be sure to take those into account when doing your math. (some have veteran discounts too)