I've seen some of your fabulous Compact Jr. project work, Larry. You definitely fall
into my category 3
Maybe 2 also!
Harking back to what I said before about the boat full of holes and sand (it had been sitting underwater!), it's amazing how it's possible to just "erase" damage in fiberglass. I maintain that anyone who puts their mind to it can make a sturdy fiberglass repair. But to make an extensive repair "disappear," when it includes large areas, re-forming the basic shape, and/or lots of cabinetry work, takes a bit more artistry.
Also, it all takes time. And money when you are talking epoxy resin, decent cloth, and two-part paint
(if you're going for a high-quality repair).
So in my opinion, it really ends up being one of those "it depends" questions -- with the answers hinging as much on the person asking (and their situation vis-a-vis time, their standards, and their goals for the project) than they do on the actual damaged trailer.