The campgrounds mentioned sound like a good match to what you want. It depends on what level of wilderness satisfies your VIBE. Unfortunately, camping and RVing are not the same. As soon as you add electricity you automatically open an area to any and all vehicles that will fit.
The most secluded spots I have been in were in WI and MI because they had no electric. We also had seclusion in a FL state park, with full hooks-up, because of the dense jungle type growth. Our experience in Kentucky and Tennessee were mostly RV parks similar to what you wish to avoid.
In my encounters, as a canoe camper in the BWCA, the people who want the rustic or wilderness type experience do not want to wake up and find an RV next to them. Likewise, many RVs do not want to dodge trees and buck brush to wiggle their RV into an isolated spot with no hook-ups.
Usually it is the State areas offer the more rustic choices and they limit the days you can stay.