Sharp eyes. The centerboards are held forward in the slot by shock cords that disappears in the beam. The bottom board can only fall down a couple of inches before it hits the deck of the trailer, and I always put a strap around the top hull at the cb case so the board is restrained from falling out, even though it has never shown any tendency to do so. The trailer is heavy enough that even crossing the Golden Gate Bridge with
25-35mph gusts hitting at 90 degrees it does not blow around noticably.