What I stated below is not correct. The span distance between the rear and the middle chock is nearly equal to the distance between the bulkheads on either side of the cockpit, not from the aft bulkhead to the diagonal bulkhead. On the trailer shown in the photo the distance is 1911 mm, or 75.25 inches. The drawing I was alluding to is C26826 which is for depicting how to tie the boat down. It does not have dimensions labelled but one chock is at the midpoint between the axles and the rear chock is at the very rear of the trailer.
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