Ill try to put up some pics, that shot doesnt really show anything, and when I went around the back of the boat I was expecting to see it totalled, and at first glance we thought it was fine, but then we got a little closer....
There is a large rip where the roller arm was dragged across the hull, you cant see it but the shaft is actually bent, the trailer is cracked, the axle has a crack in it, the lower transom is bent out of shape at the rear of the boat at the impact point - you can just make out the blue from her car on the hull. Windscreen had popped off its mount, fishfinder was smashed from something flying across the boat etc
The winch and winch arm was snapped in half, but amazingly the little safety catch held otherwise the boat would have definately come off the trailer
Anyway, like you say, lucky no-one was hurt seriously given the speed of the impact
Heres one of the arm