a combination of all the following - Killer dogs, alarms, electric fence devices, wheel clamps, Hardened tensile chain on each axel to a 200 tonne block in a vault like enclosure - is sure to slow the process down
Mate, locks only keep honest people out! I guess the goal of any security is to remove the opportunistic thief from the equation. #If someone wants it badly enough they'll unfortunately find a way...
Cheers
Rhys