I pull 30k with my f350 fairly often. It's not fun, but I'm sure the duals and more spring would help.
Question for you if you don't mind me asking. Why do people commercial haul with a pickup instead of getting a semi? To me, it seems like a semi will haul more, maybe cheaper initially, make more money, less maintenance, etc...
My wife deals a lot with shipping at her work, and she hates it when a hotshot shows up.
Definitely don't mind...
I can't answer for others but I can give you some of my reasons:
More people are comfortable driving a pick up truck towing a trailer than semi. Lower clearance, quieter, more creature comforts, etc
Easier to find and train a driver if you plan on hiring employees
Higher empty mpg's (I can get 19mpg highway)
Pickup truck can be repaired at dealers or independent shops that are plentiful.
I like the 4x4 capability of pick up trucks for 4 seasons of operation.
When not towing a trailer pick up is easier to drive and use as a daily like grocery shopping or picking up kids from school. Can you imaging taking wife out for dinner and parking a Peterbuilt at a restaurant?
I can carry 5 passengers with this for a total of 6 all with seatbelts.
Many town/city's prohibit semi's parking in non commercial spots (ie not in front of your house)
Even with the problems of the later model emission pick up trucks I believe I can buy a used engine/trans/turbo easier and cheaper than I can for a later model emission semi.
Don't get me wrong I have nothing against semis. I would like to diversify and add a semi also but it will be a pre emissions Detroit Diesel Series 60. There's plenty complaints on the emission HDT engines too. I also have a (pre emissions DT466E) box truck, this and if later a semi I will have multiple options on transport. I learned from successful trucking companies that have multiple platforms to tow and multiple types of trailers to cover more markets. I am not planning on doing hard core trucking or I would have started with semi with sleeper. I've pull single and doubles with a semi so not a stranger to them its just this is my chosen entry point.