Thanks so much again. I didn't see any "fibers" either. The inside looks like a white chalky substance (similar to drywall). I know I have Azdel in there instead of wood, so not sure what I'm even looking at.
I have decided to use a local friendly mobile RV tech to help me make the best repair possible, and we are going to add a decal that matches the others nearby and it will never be seen or talked about again.
What I didn't share at the beginning is that the gouge is because I backed my trailer just barely into fence post that was too close, which ripped out the awning arms....the gouge was created by one of the awning arm screws that tracked along my wall for 4+ inches. The RV tech will help me reattach the awning arm too.