Newest Owners!

[gawin]

This is what I use

http://www.masterlock.com/personal-use/product/377KA

[craigd]

This is what I have http://www.amazon.com/Reese-Towpower-7014700-Store-Lock/dp/B001IH8PXI/ref=sr_1_4?ie=UTF8&qid=1456669146&sr=8-4&keywords=trailer+lock+set they also sell this set at Walmart.

[mitch]

I turn mine upside down so the wheels are towards the sky.  Hasn't been stolen yet.