Not mine but I just thought I would open our minds a bit. One of the guys I deal with regularly at OReilly Auto Parts had his red 2004 RCSB C1500 Silverado stolen from in front of his home the 23rd of December. He had it looking really sweet rolling on 20s with the front end all customized and a 2" drop all around. Let's not forget we all drive one of the most stolen vehicles in the US and a great deal of us live within 12 hr of the Mexico border. A very good idea is some kind of hidden toggle switch to cut power to the PCM. It's also good to keep good old dad from borrowing the truck for a run to Home Depot when you're not home. Alarm systems are great but they only slow a good thief down a few seconds. A thief with a tow truck can't be stopped but it can stop the others or aggrevate them enough to just do a little damage and leave. You can cut the wheels all the way to the left when you park to aggrevate a tow truckin thief since the towed truck will be rolling the the oncoming traffic lane. I know I would be sick to my stomach for a long time if mine were stolen since it's 99% customized or rebuilt and I only carry liability since GEICO won't insure it for replacement value.