Originally Posted by willk
They're secure enough, but a builder friend tells me that the bad boys out there just fabricate a hinged triangular box with a hitch fitted to it. They clamp the box over your securely locked hitch and hook the box hitch onto their white van and away they go
Yup, or often balance your hitch on top of their towball and then either ratchet strap, or chain it, down. Then drive it somehwere less obvious to attack the hitch. Though I'd imagine this method would work less well on braked trailers, as the drawbar would rotate.
I had a woman come in once to buy two, heavy duty, Bulldog wheel clamps for her horse trailer, as she kept it chained to a tree in the middle of a field. Not cheap and serious bits of kit. She said she was going to fit them on diagonally opposing wheels, to make any would-be thief's life more difficult.
She came in a few months later to order a new horse trailer. Apparently the * had driven through the locked five bar gate, cut through the chain and just used a HIAB to pick the entire trailer thing up and put it on the back of a lorry.
Who'd question that, if you saw it driving down the road? Just another broken down trailer....
* insert approriately aggressive and foul adjective