RedactedNarrative: UNIT 1 WAS TIED TO THE DOCK AT RHETTS BLUFF LANDING.  UNIT 2 WAS UNLOADING OFF THE TRAILER.  OWNER OF UNIT 1 STATED HE NOTICED UNIT 2 GET CLOSE TO UNIT 1 BUT DID NOT SEE IF THERE WAS CONTACT MADE.  AFTER INSPECTING THE VESSELS, UNIT 1 HAD DAMAGE TO THE COWLING AND EXHAUST HOUSING.