sorry to hear about your theft. as a blue-collar worker i know the value of our hard earned possesions, and it sucks and is depressing to know that there are people out the who don't value anything, and are most likely just looking for their next "fix."
a good friend of mine who is a self employed landscaper just had a 16 foot trailer stolen from his driveway 5 feet from his house along with the two professional zero-turn mowers, weedeaters, gas cans, and other tools of his trade that were on it. he had a lock through the "clamp" that locks the tongue onto the ball, but it was a 2- 5/8" trailer, so if they had a smaller ball it would still fit in there enough to get it away and then cut it off and do it right.
i know that soundguy had one of his company trailers stolen a little while back, i'd wait and see if he responds with any thoughts.
i do know that surveillance cameras can be had much cheaper than they used to be nowadays, we've got a couple specialty shops here in knoxville that sell them. were there any kind of certain marks or anything on the trailer to help ID it? or any kind of serial number or anything?
i'm sorry i don't have any real advice, but i hope you get it back intact. hopefully the people are dumb enough to try to pawn it or put it on the craigslist or something. matt