Hey, we're wanting to attached a length of sail track to the fibreglass on our Sopru camper for an awning, the part that is attached to the roof, not the part that pops up. Has anybody done this? We thought we could access the back side of the fibreglass via peeling back the interior lining, to put reinforcing for the pop rivets, but found that its not accessible. It looks as though the fibreglass sits straight on the metal roof, so wondering if screwing it is the way to go? Concerned that pop rivets will pull through the fibreglass since we can't reinforce the back of them. Any input is appreciated! Cheers.