From what was said at the scene he was coming down the hill and it got the sways up,and as per usual car and trailer jacknifed,and the car ended up facing the wrong direction and trailer went into the safety barrier getting caught under all 4 strands.As a result the front winch cable snapped leaving the hook attached to the front of the boat,and the boat slewed off the trailer over the safety rail and landed as you see it.