I understand this concern. In Michigan on the Huron Shore or only a few campgrounds. County Operated I think mostly.
We were through there a few years ago for a funeral. We wanted to find a Park so we could fish and spend some time there.
The one parks was full with many with insulated hookups. No tow vehicles at all or other vehicles. Apparently they were kept there all year or had them delivered there early. A lot of people do that. Then of course it was obvious the few were set up as Residents or Vacation homes. The post Board gave name and contact for camping there but no one answered in three days.
Other Parks up there are always full also and many to most in some are Residents.
Not bad for 20.00 a day and a lot less by the week and month, on a lake in the country.
In effect Local and Rvers from places like Detroit and Chicago have a low cost Summer residence, no taxes.
We tried to locate an available spot for a week or a month with no success.
At the one store near Huron there were notices of RVers wanting to or willing to sell their rented lot access at the one campground I cited,maybe others.
In other words they get in set up with the idea of a low cost summer place.
They decide to give it up, for a profit and move on. Which I believe is not legal.
At a few RV campgrounds on the Lake Michigan Shore,they are reserved for locals, as posted at entrance. All good I guess but.....
Seems I posted about this situation once before, a long time ago.