Relating to where I live and what I have access to, I agree with Green orange.
If you want a theme park in a trailer experience, Michigan is a good place.
If you want a wilderness camping experience, I wouldn't even both with the PP's.
I just go back to a favorite lake with a tent or trailer and i'm basically alone for the weekend, or however long I stay.
No power, no running water and no public bath house, but free