Most privately owned camp grounds have seasonal rates but bear in mind northern states camp grounds open in May and close in October or November. Southern states far enough south are truly year round.
I own property with a camper on it that I keep there 365 days a year used as a cabin. If you go that route check into destination campers, they are built with the intention of long stays that is what I have. Much more comfortable than smaller normally towed campers yet can still be towed if need be. At least in Pa. If you keep a plate on it you pay no school taxes on it like a mobile home.
