I have not seen a crack form naturally in this area. However this is a weak point in the fiberglass roofs Jayco puts on their Gas Class A's and Seneca/Accolades and Maybe other models that I'm not familiar with. Bottom line is there is nothing supporting fiberglass underneath this curved area. So if someone accidentally puts too much pressure in this area they will crack/fail. It is not an uncommon place to have failure after a significant hail stone event or a tree limb impact. Based on what im seeing this looks like some undue pressure was placed on this spot and it failed. The nightmare is I believe the whole roof has to come off if you want a new one as the roof and trusses are built as a laminated assembly, them placed on unit by crane/rigging. You may be able to get someone who does fiberglass work to take a look but I wouldn't be surprised if they wont touch it. Another option might be have spot pulled up flush again and have one of the "armor roof liners" sprayed on the whole roof and be done?
Another thought is could it be possible to have some aluminum sheeting shaped to match curve like some of the other RV manufactures do and then screw and seal down?
Sorry about your situation. That really stinks!
Maybe someone who has had this can come along and provide a rosier outcome.
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