Upgrade trailer tongue lock? Chain through the wheels?

Thanks people.

I think I know which ones best.

Amplock

But one thing to consider.. A thief doesn't care if I put a lock on the coupler, he simply hooks the safety chains up and goes. Wheel locks are the only thing that's going to keep my trailer from being stolen, IF someone actually attempts it.

Then again, the price of a amplock isn't much compared to whats at stake. And locking your wheels sounds difficult