Locks + .45 ACP. If that don't do it, there's always insurance....
Locked up like this?
This is just exactly how my trailer completed the 3300+ mile ride.
The unseen part of that rigging is the hitch pin, and the two clevis hooks that connect the chains to the hitch.
all of it can be undone in 30 seconds, and the trailer towed away, hitch & ball, chains and all.
Making it look tough, might be all that is needed.