CONSUMER WAS BACKING VEHICLE UP TO A TRAILER WITH BOAT, GOT OUT TO LOOK HOW CLOSE HE WAS TO HITCH,AND VEHICLE WENT BACKWARD. VEHICLE TOOK OFF DOOR OF TRAVEL TRAILER THAT WAS PARKED NEXT TO IT, AND RAN INTO TRAILER WITH BOAT, DAMAGING BOTH. AMOUNT OF DAMAGE UNKNOWN. CONSUMER JUMPED IN AND SHUT OFF ENGINE. *AK