It was a bit special gillybob, but he took what he thought were sufficient precautions to protect the bike. Yes, you're correct, they were in the touring section of a big static site, not somewhere they would normally go but they were looking for additional activities for dgs and his cousin. They left a lovely CC site in Oxford to go there and are now wishing they hadn't. You have to be able to trust fellow caravanners-as you say you have heaps of expensive kit lying around from waste/water hogs to picnic tables and bbqs. Don't think they'll be repeating the experience. These big commercial sites aren't the best.