Well I have 2 word for you - Flat bed. If theives want your truck I don't care what you do they will get it.
I remember that we had this same discussion a few years back and one of the member said he just popped the hood and pulled the rotor out of the dist.
I have always believed that if you have a truck worth stealing then you should have a good insurance policy and a current appraisal to go with it!