Kill it? LoL, lord no, I've never heard of anything that will kill the stuff. I grows prolifically all over the SE United States. My grandfather used to call it "twenty mile a night vine". LoL, I'll never forget that. And yes, I can believe a mess of Kudzu would be capable of stopping that dozer, the stuff literally is that expansive and intertwined. It's originally a native plant of Japan, planted here for erosion control on slopes and such, but it has exploded out of control. Typical with man and his bright ideas eh? It's usually considered a nuisance plant/vine as it completely overgrows all other native growth, but with you and the dozer, I think that's one of the few times it's not.