Bobber down,
I have done exacytly that for quite a few years now.I keep nothing of value in my truck and leave the doors unlocked.I have an old kraco stereo which I removed the knobs from.Let them look around I would rather have that then have to replace the window or locks.I started doing this after spending a couple of years as a car stereo/alarm installer as a kid.saw too many vehicles with alarms get there windows broken only to have the security system scare the jerk away.