I just had a B&W Patriot slider installed. Not to be paranoid, but I'm thinking about how all you got to do is pull 4 pins and it could be lifted out. Two questions, first, how many people use a locki...
My hitch has the same lift off head. I have a cover over the bed, when not towing, so out of sight. It depends on the area your truck is parked, but a cable lock would help to deter theft.
You see some hitch pics on here, with locks, but I don't remember anyone posting that their hitch has been stolen.