I use a cast aluminum lock with a pad lock on my gooseneck.  My thought is that is would just slow down a thief or cause them to go somewhere else to one without a lock.  To really lock it it would need a lock/cover over the gooseneck bolts. Also a member to Texas & Southwestern Cattle Raisers . . . those guys are great at tracking down stolen equipment.

That is all for my own peace of mind. I haven't heard about "all the trailer stealing going on" here in North Texas. What part of Louisiana are you in? Have many been stolen?

I was up in Tulsa Ok in Sept for a Nationals Horse Show and I believe 5 or 6 trailers were stolen right off of the facility lot, some during broad daylight. I see on this website where there have been trailers stolen in just about every state.

I certainly understand your concern at shows . . . it would be very easy to hook up and drive off under the "cover" of the crowd.

After I unhook, pull forward and put the lock on the trailer I always lower it down several inches below tail gate level. Like the lock, it really is just one more thing to slow down a would-be thief. They would dent their tailgate top or have to spend another minute or so raising the trailer.  All in all I am counting on it being easier to go after a trailer other than mine.

I basicaly did the same as paintthatain't. On mine I have a removable handle. The shaft that the handle hooks to goes through the side of the trailer to the jack and out the other side of the jack itself. The jack is made so a manufacturer could put the handle on either side of the trailer. I lock a chain from the jack extension to the shaft. Then I checked and made sure the trailer had good insurance.

We sell a gooseneck lock model TL-53. It has a piece that goes over the coupler then a smaller lock that goes over the adjustment bolts so no one can slide it out.

Gus posted about thieves having a tire rim bolted in the bed of the truck.  Even a coupler lock is easily defeated with that.  Locking the jack handle is little trouble too.  A bottle jack to raise the trailer, remove the landing foot, and the wheel rim takes the trailer to the chop yard for a leisurely resale. The locking of a wheel and a lug-bolt lock is the most time consuming and obvious thief barrier.  Remember, there is nothing absolutely theft free.  Just make the BG work a little harder and they'll move on.

I wrapped the chain around the foot pin handle so you can't pull it. I agree there is no fool proof way. If you can make it a pain maybe they will take someone elses! The chain is long enough to use on the wheels....but I have to pop the hubcaps off to feed it through. I like the jack method because I can get out of the rain to install it! It is also cheaper than a coulper type lock and has many other lock type applications. 

Law of the jungle !! you don't have to be faster than the lions.  Just faster than the slowest of the bunch you're in.

I don't have a lock now, but I WILL and I'll use it too!