I am glad to read of people taking advantage of RV parks. That opens up the national parks & forests for us. Thank you for that!
Last year we were out for 4 weeks and stayed in zero RV parks. Government owned camp grounds range around $20 for non-hook-up sites. When in-route, our costs are free at Walmarts and rest areas and such. About 2/3 of our camping fees were ~$20, 1/3 were at free locations. It helps make our gas-hog vacationing work for us.
Three years from now, if an RV park refuses to accommodate us for the 10 year rule, I think my wife and I will burst out laughing.