ScTrucker,
It can be as easy or as hard as you want to make it to steal or vandalize your truck.
Unfortunately, we live in a world where some people just don't respect the property of others, and no matter how much we would discourage it, some wise-a** is always going to be lurking around the corner.
I would suggest a hidden ignition cut-off switch of some type. I certainly wouldn't go with an alarm, as I believe most of society has become immune to the sirens they use.
My 46 has a shut-off valve on the gas line, at the tank. Unless you know it's there, or were ambitious enough to crawl under the truck and look for it, you'd have a real tough time getting my truck started. It sure wouldn't prevent someone from loading it up on a flatbed though.
I'm sure this topic is bound to get you alot of responses. I'm anxious to see what others might be doing.
Generally, I just make sure it's not too far out of sight. I guess I'm fortunate, that I don't have to use it as a "daily driver".