Yes, drive a truck that looks like mine.
A guard dog..... shotgun.
There isnt really a way to stop them, but the harder you make it on them the less they are going to want and try to get your stuff.. mount your stereo out of sight, in the glove box or counter sink the radio in the dash and make a panel to put over it when not in use making it look like your truck doesnt have one at all. A kill switch in your truck is always a good bet, with all the other wires under the dash and under the hood I am willing to bet most hoodlum thieves arent mechanics that can quickly diagnose a kill switch for the ignition system or fuel system or both.