To be fair the regulations on vehicle length and older infrastructure makes the cabover popular.
American style trucks(long nose) get better mileage on longer hauls than the blunt nose design. They also provide more cabin room. As a final note American audiences are conditioned for the long nose design and it’s difficult to find the imports here.
Having driven both I think they both have merit. In Europe an American truck would be impossible to maneuver in towns.
So that’s the “real reason for it”.
That would be great. I don’t know if the aging American rail infrastructure that is already being utilized would be able to handle it. It would be a big ticket item that Congress would need to pass… Oh well that was a fun though experiment.