You know, someone on here mentioned that the passenger side mirror - unlike the driver's side - had no blind spot mirror built-in, and also unlike many other vehicles Ford makes.
So that led to me buying one of those stick-ons, a nice-looking one. So I put it on, and what do you know, it doesn't do a darn thing in terms of improvement. That's because that mirror has the "objects are closer than they appear" thing, which was actually the same viewing area that was in the little stick-on.
No doubt a towing mirror would be better, but for me, the stock is just fine. Took me putting on that smaller one to see that it doesn't help any.