Trailer Tongue Locks to prevent theft.

Just an FYI those first two pictures do not work on the original hitches Shasta used.

I purchased this from Sportsman's Warehouse..... it has a optional cable add-on that will run through your propane tanks and in my case also my spare tire!

FYI: This issue was discussed in a recent thread on this forum: vintagetrailertalk.freeforums.net/thread/2341/protect-trailer
It always seems to open up a broad range of topics, from locks to 'agreed value' insurance to GPS to firearms! I think everyone finds their own comfort level… but many point out wisely, that 'agreed value' insurance should be the safety net at the bottom of your plan regardless. Wouldn't it at least be nice if you could get ALL of your money back in the end? If you can put GPS tracking on your trailer, that's fantastic; that can probably go a long way to helping police locate your trailer. As a first defense, I would research and use TWO types of locks on your trailer: one on the hitch and one on the wheels. Regardless of how hard/easy they are to defeat… two is better than one for slowing theft progress. I've looked into some not so common types of locks if you want to PM me. A reenforced secondary door lock or barrier wouldn't hurt either if you're concerned about theft inside the trailer. The doors are so darn easy to break open, this is probably the first place a casual thief looking for odd merchandise, food, change, etc… would probably go for.

Also… a good thread here on camping in back country areas: vintagetrailertalk.freeforums.net/thread/3189/camping-lands-remote-spots-security?page=2&scrollTo=31359

And… for the LOL department, this video, sponsored by the "Mega-Hitch" hitch lock, demonstrates clearly how all of these common  hitch locks can be defeated in a minute or two, with simple tools from the trunk of your car.  Also, the advent of battery powered Sawzalls expands the thief's capabilities.  (Never mind that the Mega-Hitch would be no harder to defeat than the others, IMO!) www.youtube.com/watch?v=-G_zz80h_Tc.  So, I still say, 2 independent forms of locks, plus "agreed value" insurance… and GPS if you can swing it.

I'd replace the hardware store U-Bolts that are holding your safety chains on with some good quality Grade 8 bolts with hardened "thick" Grade 8 washers, and nuts.  You can normally get 7/16" bolts through the safety chain links, but check and use the largest possible for your chains.  Any good industrial hardware store stocks a wide assortment of Grade 8.  ACE has some, but they are expensive, and the selection is small. 

Here is the lock that the PO gave me when I got my Compact. Hitch is a little beat up but the lock fits!