those parts are in high demand. maybe from rebuildable wrecks, to trucks where the original one burnt out for one reason or another.
much like the supplemental air bags in the steering wheel..."smash and grab"...thief smashes the drivers window, rips out steering wheel air bag.
where there is a demand, there is a market.
get better locks for the doors, and maybe in cab cameras and an alarm system........yet another high demand commodity to grab your money...security systems.