You will find a lot more information about this on the various vandwellers forums, as they are very much into this long term staying in one spot. However, having over my last two trips visited many public land campsites, the majority were without a camphost.
Not sure if this is because folk are shunning the responsibilities expected for little or no return (mostly free camping) or that there are no takers for the more remote campsites.
BTW, I note that you have not yet been formally welcomed into the RTA community - Welcome to the Great American Roadtrip Forum. It is always appreciated when you can jump in with experience and local knowledge.
Lifey