trevHCS:
It could even be the better position in a truck that makes some difference. You get more view (sortof) so aren’t straining to see mirrors etc like in a car.
I think this is it, for me at least - but not the views, the actual seating position. In a truck I’m sitting upright so the spine is in a (relatively) natural position where as in a car my backrest is usually at 45 degrees or more (I’m 6’4") so I’m always half-lying down and tilting my head forward because the headrest is way too low to support my head/neck although that wouldn’t make much of a difference I suppose.