Docking is only one problem where those are not wanted. Other situations are specially on winter almost everywhere you drive on smaller roads. There are huge potholes on the road. Also threre are lots of speed bumbs which arent designed for long and low trucks. On winter the side banks become also higher when snow is plowed to the side of the road. When you cut through corner those are the first thing that fall off... Hinged side fairings are one step to right direction, but I would say that those are broken during first year at least on finnish weather conditions.
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