It seems the thieves are rampant,, stealing trailers all over, No matter what kind of lock you have on the hitch, they have figured a way to tear it off and off they go with your investment. In comments, reply how you secure your trailer of rig for safe storage.
I gave up on tongue locks, Got expensive replacing them after someone tried to tear it off and was possibly disturb and couldnt finish.
I rely on a chain thru BOTH rear wheels, across the axle, criss cross so when they try to roll it, it binds up and stops them,, I know, its NOT 100% full proof. But the manager at the storage place will investigate if something looks fishy with someone trying to pull my trailer out..
Now,,, there is a full proof version available but I dont think its legal,
3lbs of c-4 packed nicely under the hitch with a pull detanator,, makes one heck of a boom and a mess of the trailer tongue (and possibly a few windows with in a 4 mile radius),, but it does stop the bad guys really really quick.