You may end up having to buy a rear view camera system. They can be had with just a single camera that sees the rear in a 130 degree field of view, they can be had with the above camera and additional cameras to mount on each side of the trailer....lots and lots of options out there, but I don't know of a way to extend the mirrors out any further. BTW, I have a 2016 F350 Dually so I know exactly what you are talking about. I tow a Momentum 394 that is almost 44' long and 101" wide....same issues.
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2016 F350 Crew Cab Dually Diesel King Ranch 4x4
2018 Grand Design Momentum 394M Toy Hauler
Excessive Payload Capacity is a Wonderful Thing!
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