How to keep thieves from stealing our 16' trailer?

No ball lock is going to do the job on it's own. What about the chains?...HELLO!! You can still tow away a trailer by using the safety chains...make it so you can remove them when you store it. The combo of a ball lock, wheel lock, and no chains deterrence will most likely make a thief move on...anything can be stolen...just make yours real hard. I agree with Grit dog...don't be foolish and keep anything of value in it while it is stored..