The mirrors are extendible on that one to accommodate with the width of a trailer. If you look at the truck in the picture carefully you’ll see that they’re actually telescopic. When you are not towing anything you are supposed to, and indeed required by law in many states, to pull your damn mirrors in.

Zero percent of truck owners actually do so, and it’s not enforced either. So yes, you wind up with morons thundering around with pedestrian/bicyclist clobberers on the sides of their trucks all the time.

Even more absurd are the strap-on towing mirrors which, again, their owners inevitably never remove.