I don't like to get involved in truck brand wars, but I have to agree with FishOnOne. Ford Owns Work! I know this cause it says so right in my SuperDuty brochure.
Also he is right, many are not diesel engines. The 6.8 V-10 was used in many work vehicles, as is the 6.2 in recent years.
I might add that if I were heavy hauling, RV delivery/Hotshot, I'd be using a diesel, likely a Cummins. :)
Jerry