[Desert Dan]

Jeff

You might be able to mount the winch with large allen or torx bolts that would foil an un-prepared thief.

You could also tack weld a small piece of metal accross one or two bolt heads to slow them down.

Heck anything is possible
A buddy of mine had his catalytic converter stolen from his truck at a park and ride. What a surprise when he started the truck with a straight pipe. He is going tack weld the bolst on the replacment Cat.