Thinking back to this post:
And using my questionable math skills … @jdc 's roof seems to me to be pitched at just shy of 42 degrees.
The implication in his post is that the panels aren’t the problem so much as the buttressing of the roof structure in order to reinforce it against possible lift-induced damage.
So … yeah … you may need to reach out to a panel manufacturer and an architect, structural engineer, knowledgeable roofer, or other professional.
ETA: I doubt I did the math right (I’m tired), but the point may still stand 
Found an online calculator for this: JDC’s roof appears to have a ~42% grade or be at a 22.6* pitch – JFTR.