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I wonder why people don't use steel roofing panels (maybe they do and I just haven't run into the thread yet). If you get the lightest guage they are quite light and only 2 3-foot panels would be needed to span the car width. It might also be possible to still find aluminum corrugated roofing like they used years ago to go even lighter, or maybe even polycarbonate (although I wonder about the fire resistance of that).
In the Home Depot and Lowes stores they only go to 12 foot lengths but the longer panels can be found easily too.
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