I would think those would be in the way and collect more winter grime than a pair of easily removable side skits that are flexible. It was just a couple months ago someone posted a company that made skits that would flex if they hit something, but held their ground at 65mph. They also flipped up or removed and could be placed completely out of the way for servicing the trailer.
I don't think these current renditions are a great step. but at least someone is thinking about the problem and making solutions, even if they aren't the best ones.
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