I had a camper stolen. I had a hitch lock. They hooked up the safety chains, and drove off. Full story here:
http://2manytoyz.com/stolen.htmlI now use a Trimax wheel lock. Got mine on Amazon:
https://amzn.to/2D96O91
Bottom line, if the trailer can roll, you've not even slowed down a thief.
On my utility trailer, I use a Python lock. The coated cable slides easily through the wheel spoke, and through a stake bed pocked welded on the trailer frame. Also available on Amazon:
https://amzn.to/2UZVNRo