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Those can be pretty good for towing. All you need to do is extend them out a little (and put a wide angle mirror in the upper, outer corner). Here's a pic of the driver's side mirror on my truck with a homemade extension. It looks a little redneck, but it works well, and it's easy to return to stock when you're not towing. (There's a slide-in camper in the truck in this pic, without the extensions I really can't see behind it.)
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.