Here in Austin, it isn't moving to the ghetto; the 'hood is moving into Austin. This is why I want none of this, and store my rig so far outside the city limits. Even with precautions, I still get attempts at stealing my truck's tailgate. I recommend the Master Lock, but the McGard one I have (which is essentially a glorified hose clamp wrapped in plastic and using a funky screw head) has kept my tailgate on my truck. I also learned to not bother locking the tailgate handle -- a good hit with a long screwdriver will snap the handle lock open.
Of course, I've even had bags of camp waste including bagged poop stolen from the bed of my truck before.