I have a '77 25 and a trailer that was being customized by the former owner. I need to set it up so that the tongue weight will be approxitely 250 to 400lbs at the hitch which would be about neutral since the trailer has that empty. So, in order to set a keel stop on the base plate of the trailer and a bow roller, I need to know where the fore and aft Center of Gravity is in relation to something I can measure; mast step, bow, stern, front of the centerboard trunk, whatever. SO! Basicly I need to find out what the hull's dimensions are. Anybody out there have any measurements?