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You can request the roof drawings from Thor as I did. The thin metal and underlying luan is not thick enough to keep screws from pulling out as you go down the highway. There are aluminum stringers about 15.5 inches on center which can be located with a (density-type) stud finder. Locate the center and you can use well nuts to secure the panels. I installed the 100 watt Renology panel using their brackets. Locate each bracket near each corner of the panel so one of the two holes is centered on the Aluminum stringer. You can install another well nut on the other hole. Although the roof material is very thin, the well nut does help spread the load a bit. Just be sure that you have connected to the stringers with one of the attachments near each of the four corners.
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