Wincrasher, Thank you very much for your quick reply. It's a long shot project, so no need to rush to get the info you have. My guess is that it can be found somewhere in the Fiamma manuals you received. I wrote to Fiamma USA, and i'll post their reply.
My 200 lbs already tested the PM roof, and it seems strong enough if you stay on the sides
Enjoy the good life in the Travato!