Longest I personally know of isn't a mopar. Its a 66 Mustang. been sitting outside next to a house since 1968. Young man who owned it, got drafted, was KIA'd in Vietnam during the Tet Offensive. I've spoken to his dad on it several times. Nice guy. Will not even discuss selling the car. He'd given it to his son on his 18th birthday as a present. Says it can rot into the ground to rejoin his son. Kind of a sad story. Its sunk in the ground so far a good 6 inches above the rockers.