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Another consideration of a significant downside not yet mentioned with "impregnable" fabrics used horizontally, especially with topside stiffeners, if any water is trappable above, from drainage above, rain or road spray, great efforts need to be made to ensure water buildup/ponding does not occur, by having needed slope/clog free drainage/or total sealing to prevent entry. Water is of course heavy and fabric failure is easy to visualize with enough water trapped in dynamic loading moving at speed.
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