nothing will stop someone with a trailer..
the fastest way i've heard to steal a car is..
1... have someone pop the bonnet put expanding foam in alarm siren.. cars without bonnet sensors might not even go off at this point.. and if they do you're hopefully en-route
2.. have a lorry, trailer, van big enough to lift at least the front end of car (to beat steering lock..) for towing.. and you're off to a quiet place for removing troublsome locky type items.. stripping or whatever its being nicked for..
also any well tooled thief will have a set of motortrade grade keys.. my dads mates in the trade and its scary how fast he can get in a car.. there is also a "cracking kit" for locking wheel nuts..