I do like the ammonia idea, although you will get slapped with a lawsuit so fast your head will spin. And with the top-notch legal system in this country, you will end up paying out more than your truck is worth.
Ironically, I only lock my doors when around friends, i. e- at their houses, at work (which, by the way is inside a barbed wire locked fence), at the firehouse, ect. . so they can't do all the "immature" crap we have all done- grease on the steering wheel, turning volume all the way up on the radio, rolling all the windows down in bad weather, ect. .
Let's face it, crooks are gonna get in whether you like it or not- I will allow them to get in with as little exterior cosmetic damage as possible.