I ask myself what the thieves actually do with the caravans that they steal. The site where I keep my caravan is generally left unlocked and only a handful of caravans appear to have any form of theft deterrent, yet I've never heard of one being stolen. I asked a dealer about this and he said that as caravans over here are all registered, those that are stolen can effectively only be disposed of by breaking up for spares, and that's not particularly profitable. It's a bit different with cars because there's a market for them in some overseas places.