In Amberg, you can park in the Ranger City Rider's clubhouse parking lot. I have only parked there for day trips, but I think you could park there overnight as long as you dont park in the way of their groomer. To get to their clubhouse from 141 just turn left on the first street after the gas station (Amberg Rd) and go 0.2 miles and the clubhouse and parking lot is on the left. Also, there is the big parking lot by the airport in Dunbar, but for some reason I am thinking that one does not allow overnight parking, but I'm not sure.