Need a place to park

I am looking for a place to park a motorhome for 2 or 3 days at a time while fishing out of Fenwick. My boat is slipped there and I live in Cincinnati. Fenwick will not let me park a motorhome on their property because they can’t allow “camping”.
The unit is fully self contained and we would be pulling a car to go back and forth to the dock. It is just my wife and I and we would not need to have contact with anyone. Just need a safe place to park, maybe a Church parking lot, closed business or whatever. Any help or comments would be appreciated.