Coming from the experience of thieves attempting to steal my entire rig (and failing to do so) I upgraded the protection for the trailer as follows:
I got a "Carry the Big stick" before the 2008 financial crisis put the company out of business along with the two mounting hub option. The idea there is so you can move the stick boot to the side of the trailer that is most visible.
The lock cannot be drilled because it loose spins. Breaking the lock with a freeze technique will not work either due to the physical construction of the lock housing, You cannot beat it off, you cannot pry it off. I think the only way to defeat it would be with a cutting torch, and to complicate matters further the lock can be installed on the physical bottom of the enclosure housing.
This and a layered suite of theft deterrents on the tow vehicle will make your rig a fairly hard target.
I did find the old sales video: