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"But, how big do outside mirrors really need to be?"
I don't know about your E-150, but the Ford Super-duty trucks actually have two mirrors on each housing. The main mirror allows you to see behind / beside you as normal but there is a smaller mirror that is pointed down and is a real life saver when trying to back into a rough spot and you can't see if there is something about to be run over by your rear wheels. For a work truck FE isn't everything.
Have you considered mounting a mirror INSIDE your window? Does your state allow review cameras?
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