From what I'm seeing in the Amazon pictures and description, this is designed to be tacked to a solid surface, like plywood. Otherwise, it's similar to a tarp. If you were thinking of just stringing this across the gaps without any flat support above it to attach it to, I wouldn't do it. I think it would work it's way loose at highway speeds and behave like a tarp...loose and flapping away. Just my 2 cents.
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