I catch the odd person staring into my car, some have actually grabbed the door handle. I take some precautions whenever i leave my car. Doors are always locked, i don't keep anything valuable (minus $20 and some slips), especially in sight, my sub isn't in anymore. Alarm, though is kinda crappy, is turned on, and my last line of defense is my fuel cut-off switch compliments of the previous owner. Its hidden under the drivers side of the centre console, sometimes my friends play tricks on me and turn it off while I'm like running into the house for a sec. Spend 10 mins trying to figure out why it wont start.
These cars are the easiest to steal so least they cant drive it away. I havent heard of anyone using a trailer to steal cars around here, guess its just not common in our city, cops seem to be everywhere lately.