think tow truck.
meh, club lock, alarm, immobiliser, even take the coil pack loom off or the coilpacks if you're that paranoid, if they still take it they are likely pros and have been sussing it out for a while.
I've heard of people having D shackles set into concrete floors so that chains can be put through the wheels (have seen pics of this done in a garage which housed a VL Group A lol).