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I have only a 12,000 Gross E-350 diesel and know next to nothing about the big rigs. Is it true that the semi tractors use some sort of high-pressure fueling system at truck stops that is incompatible with smaller vehicles? I guess they could use a regular green handle nozzle if the faster system were unavailable. Also, would an untrained person have any chance of driving a big rig (at least until they had to back up)? I imagine there are different classes of tractors and different types of transmissions. Thanks, I have wondered about these things for a while.

The diesel at the truck pumps comes out much faster because they have 75-150 gallon tanks on each side.

and it would take quite a while to fill up at the slow speeds some of these regular car pumps put out.
Gas pumps out much faster in English pumps, BTW.
Driving most semis involves double-clutching. Upshifting, you let the rpms drop about 400RPM and
then shift into the next gear.
Downshifting, you have to increase rpm by about 400 and then shift into the next lower gear.
Takes a little practice, but nothing much more difficult than learning to drive with a regular clutch.