I am the other owner of this boat.
By any chance was it trailered on a conventional trailer with rollers on rather than carpeted cradles
Guess you are right. We put in pillows to cushion it though.
We have now sanded down to the inner layer of fiberglass, and discovered the crack goes all the way through and has turned 90 degrees on the outer crack. Is it possible to fix it from the outside or is an inspectionhole necessary.