It was King's first NASCAR victory.
Timothy Peters finished second, giving Red Horse Racing a 1-2 finish in the series opener. Justin Lofton was third, followed by Travis Kvapil, Jason White and Todd Bodine.
King turned leader Johnny Saunter around on the second of three attempts at a green-white-checkered finish, but the real gasps were saved for the final melee.
Joey Coulter slammed into the wall shortly after the final restart, his truck lifting off the ground, hitting the fence and then spinning back across the track. Coulter emerged a few minutes later unharmed and bowed to the crowd.