I use a Gorilla Hitch Lock. I would YouTube videos on various hitch locks and how to bypass them. There is always a way to get around the lock. Including portable grinders.
I like this hitch lock as the key is under the hitch, which makes it harder to drill out. A YouTube video showed someone with a loooong pry bar, pop it off.
If you have an electric tongue jack, reroute the wire and add a hidden switch, to turn the power off to it, so it wont move.
Also make sure to have a power disconnect switch that turns off power to the entire trailer, some do not turn the power off to things like a remote operated slide/awning, along with auto levelers (typically a 5ver issue).