Weld your nut on the ball, master or Reese make decent locks, use cable instead of safety chain and lock it to your truck. Make it hard for them. In the end all it does is keep an honest man honest. Can't stop a thief.

If it does happen a 16' flatbed trailer will work in a pinch. Actually knew a guy that had a 1672 jon, and that's all he ever used is a dual axel 16' flatbed.