As I am in the middle of a frame off restore, I am contemplating engraving every major part on the Bronco, I was told a story of how some one did this and took pictures off each engraving/part. his truck was stolen and was able to find some of the parts at a swap meet and call the police. the truck was a Chebby, meaning a lot more chance of chopping and selling.
I am considering a battery cut off switch, alarm (with fuel cut off), club, a chain/lock on the hood. maybe device a way to lock the shifter into park with a pad lock. most of the time I park in my house, where my dogs and alarm will suffice, some times I park at work (security guard). Once in a while I drive to Tijuana Mexico, then I do not stay away from it for a second, it is always on eye view.
I guess all this items intended to make it less desirable, due to time for the thief, and will eliminate joy riders, but ultimately insurance will be required, in case some one tows it (happened to my sister's expedition) or pulls a gun on you.