Not just breaking into trucks, but sabotaging as well. I've heard stories of folks that will sabotage your truck simply because of the company that owns them, usually because they used to work for them and were terminated for one reason or another.
Also, try to find out if the company being applied for is a "zero tolerance" company. From what I've gathered, avoid like the plague. Could be sitting at a light, get rear ended, and they still terminate you.