Slideout awnings are usually "Toppers" and are not effected by wind. They roll in and out with the slideout. Some folks have had flapping issues with some toppers, but I haven't. There are some models avail now that have some supports that keep them tight and avoid any flapping and water trapping. I think they are made by Carefree.
There are also slideout awnings that roll out as well, but also have extendable
feature to give shade to a window below. These if extended, would be subject to wind issues.
Cheers,
Bill
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