The Buffalo Force Protection Vehicle
It can crush a Hummer, clear a minefield and keep you safe from grenade-chucking survivors hoping to kill you off as you fight for that last barrel of oil or pool of freshwater. It may not be the most comfortable choice for long trips, but it does come with a space shuttle-like mine raking arm, which JoSCh points out "could skewer a cadre of zombies." Perfect. Oh, and if you pick the right one, it may even transform.