I normally don't secure my trailer hitch but when the trailer is going to be unattended for a few days or more I put the light weight yellow one above on and then a case harden pad lock on the hitch so if they popped off the first line of defence the hitch would still have a ball inside it and they would have to cut the lock off to. I figure visually that gets the majority of the bad guys to look for different low hanging fruit. Also in my case it is a tag along trailer with my toys inside, they can easily cut a hole in the thin aluminum skin to see if it is worth their trouble.
