Originally Posted by Lefty59
Another suggestion came to mind...
You might want to wrap your safety chains up around the frame and lock them too or put a quick disconnect in the chain then remove the safety chains altogether when not towing. Someone on the forum posted a video about folks stealing travel trailers by simply using the safety chains to hook up to their TV and tow it off.
You may be talking about this one:
One way to steal a trailer
EDIT: I see that the video in the link has been made private now for some reason. May have been teaching too many thieves how to do it.
Here it is, shortened somewhat in another one. The premise is, you just have to wrap the safety chains tight around a hitch ball...and off you go. In the original video (made private) it showed more detail.