Last year one of our groups tents got raided while they slept in it. I got bits taken off my car and just groups of chavs playing music all night and looking for trouble. Our neighbours were a nightmare till we had a word. Throwing cans at each other and one hit my mates 63 beetle. They moved after that incident put it that way...
Just keep your wits about you and your goodies out of sight.
I'm gonna hold out for VW Action, much more chilled and people there are sound.