It looks to me like this boat went aground on some rocks or hit a dock multiple times during a storm. Something punched in a large area of the hull, causing multiple fractures at a variety of angles.
It’s obvious from the interior picture of the aft starboard birth that someone previously cut an access hole To get at the hull from the interior. When they replaced the cut out they simply glued it in place, they did not properly bevel new glass into the repaired area. The cut out panel has popped up due to compression on the outside of the hull from the trailer pad pushing on it laterally.
I really don’t think this is damage caused by the trailer Bunk. The pattern of the cracks on the outside of the starboard aft hull would look quite different if the damage were caused by a hard spot at the aft end of the trailer bunk. There is an area of concentric cracks in the gelcoat that can be explained best by a hard collision. The pattern of cracks always tells the story about what happened to the boat.
(There’s a small chance the Boat was dropped from a great height onto the trailer and it bounced around causing multiple fractures like that. But that would be really unusual. It’s far more likely that The damage was caused by waves banging the hull aground or against a dock or against a dock. It would take multiple impacts in different places to cause that kind of widespread fracture)
Anynthing fiberglass can be repaired as good as new, but who ever did those repairs didn’t know how to do it correctly. I suspect the person put patches over the fractured hull did not cut out the original laminate and scarf in new glass. When you patch over Old fractures, the fractures and patches create hard spots and stress risers and the repair always fails sooner or later. It is imperative to cut out the fractured area completely, replacing it with a new laminate of similar thickness and flexibility, and with a 10 or 12:1 scarf /bevel where the new laminate meets the old.
To be sure, I’d want to pull up the cutout in the interior and have a good look. That will tell us a lot. I’m willing to bet there are hidden repairs on the inside surface of the hull.
Judy B