Here's a dumb question, why do you need a hitch lock? I park my TT on site at home so no concern there and on the road I guess I just never worried about someone unhitching a 7500lb TT from my TV or at the campground lifting all the stablizers and moving all my stuff from underneath and hooking up my TT to their TV and driving away, slides out and awning flapping as they exit the campground. I had a padlock on my Pop-up because I figured it could be unhitched and moved around by hand, but a heavy TT isn't going to go anywhere fast. If someone wants my stuff, wouldn't it be easier and quicker just to pry open a window and climb inside.
Idea!! Want to lock any trailer just weave a short braided security cable thru the spokes in the wheels and secure with a good lock. Works on ATV's, mowers, boat trailers etc.
I have good locks at my house, but didn't go overboard with big dollar stuff on the doors and windows when all it would take is for someone to pitch a lawn chair thru a window and have at my stuff. Alarms only work if you have LE fairly close. My backup [can us camping too] is to secret a trail cam to watch over things. Somebody does me wrong while I'm away and I have a pretty good chance of getting a pic of a vehicle and lic plate and the bad guys as well. Makes it a lot easier for authorities to find them.