Is it coincidence that this trailer has a substantial cargo box mounted on the back, with no counterbalancing added mass in the front, and that it somehow fell over? Just speculation... I have to wonder what events led to the Humpty Dumpty effect.
Since the basic shell is the only part of this type of trailer which is not practically replaceable, this is not a project I would be looking for - but that's just me, and I'm not a
fiberglass repair guy.