Can anyone help me account for the difference in displacement between these two models? I believe they had identical hulls, ballast, and rigging. The interior, deck and cabin trunk were redesigned for the MK III; but 2000 lbs? That's a frigging lot for a boat that size and I can't even imagine what they could have added that would account for it. And should one then assume that is 2000 lbs less payload that can be carried in the MK III?