RedactedNarrative: Driver of vessel reported 2 persons being pulled in separate inner tubes.  Driver 1 was looking in rearview mirror at tubers and was unaware they were approaching stern of vessel 2 and vessel 1 struck vessel 2.  Driver of vessel 2 reporting driving slowly on west side of lake approaching cove area when he was struck on the left side of stern by vessel 1.  Vessel 2 reported 2 injuries to occupants--1 cut on head and a case of whiplash for another occupant.  Total property damage to both vessels is estimated to be above $2,000.00.  Vessel 2 reported damage to the deck and rear areas of the vessel.