don't use the car to remove a rock.

After we came back from our visit of Obersdorf,the weather was changing from warm and no winds to rain and hard winds.So arriving at the campsite we had to unload the car and and normal i parked the car on the parking at the outside of the camping.But now we had to secure our front tent of the caravan so i left the car for a moment on the track.During our work on the tent our neighbour want to leave the camping and i had to displace the car.So in reverse and back of the track.And a loud bang a shaking car and a screeming neighbour let me stop the car.What happened ?????????? I hit a rock what they use for decoration on the campsite.I moved the rock for about 50 cm.And the car??? i had about 3500 euro damage,but the holiday was great.