Ever since my husband and I saw a youth trying to access a caravan (in broad daylight) we have been reluctant to stay in such places. It was very busy with lots of people around but this was not a deterent. He kept moving from van to van trying the doors. The owners were sitting in their car having a sandwich at the time! Why not have a look for a local caravan/camping park, which would be more secure, if you only want on overnight stop.