On a recent journey to Corwall we stopped at Sedgemoor Services(J22), the designated caravan parking area is very poorly maintained.
The parking area is separate to cars and HGV's, it is unpaved, a rough piece of ground full of pot holes.
Whilst we were there, we observed a caravan pull on who drove through what he probably thought was a little surface water puddle, but turned out to be quite a deep water filled pot hole. The result, the front of his van smashed into the ground as his back wheel sunk into the hole.
I will avoid this one in the future.