MY TRUCK WAS PLACED IN "PARK" MODE. I EXITED THE VEHICLE TO OPEN A GATE. THE TRUCK WAS STATIONARY AND RUNNING AS I WALKED UP TO THE GATE BUT AS I WAS MANIPULATING THE COMBINATION LOCK ALL OF A SUDDEN THE TRUCK BEGAN MOVING FORWARD AND HIT THE CLOSED GATE. LUCKILY I WAS STANDING SLIGHTLY OFF TO THE SIDE AND WAS NOT PINNED BETWEEN THE GATE AND TRUCK. I WAS BUMPED BY THE FRONT CORNER OF THE VEHICLE BUT SUSTAINED NO INJURY. VERY SCARY SITUATION GIVEN THE REMOTENESS OF MY HOME LOCATION.