Here is a quick measurement--and it is the total height of the boat--since bunks are not the same distance from the frame of the trailer.
75" from the waterline, amidships just forward of the head bulkhead. From the waterline to the bottom of the center of the boat (using a 6' level) it is 12". So the total you need for the clearance is 87" Plus the height of the cradle it sits in. This did not include any antennas, radar arch etc--but was to the center of the cabin roof raised part (again with a 6' level) This fits fairly with with the advertised "head room" of 6'10" (or 82") allowing for the rudimentary "keel" and laminates, which are balsa cored.
They need more than this, because of the fork lift tangs thickness, and the tilt to get the boat in place. But I believe that 87" is a safe number.