OK, i tried doing it myself. I set the weight to 225000.0, the collison to .0001, speed to 300, and acceleration to 40. I messed around slightly with others after I first failed.
Cars would vanish when touched. I don't know if they flew away, or sunk becuase a Bobcat went into the ground with only the back of it sticking out. I edited a BMX and I shot the rider and the whole thing vanished. I had a BF injection in a garage, I opened it and it was on its hood, spinning and on fire.
So I need help from better people than i am.