Don't know how many, but a decade back I talked to a lady that was full timing in small pickup w/shell and 5X8 teardrop trailer. Saw her struggling with basket of clean clothes, a door, and walker, so set basket on tailgate.
Walking by site, saw trailer and trucked parked so she could move from trailer to shower tent with some privacy.
She said she checked into state park for 2 weeks allowed. At end of that the COE CG on same lake showers would be open. Stay 2 weeks there, then move to park in another state.