Well I have a drop hitch, custom made far as I know one of a kind making it easy to identify, it's secured to the RV with a locking pin for a 2.5" receiver (Turns out the pins are the same size on 2 and 2.5")
And an Anti Rattle Clip (Pictured by an earlier poster) as well, nice and rusty nuts took all I had to tighten them Doubt average thief can remove.
The tow bars.. Well that pin is locking as well...
The reason for the anti-rattle is the drop hitch was modified to carry my Bicycle, custom job from Blue Ox.