IIRC the cab on a 6X6 is 6" wider and is actually a ROP design.
As for the stick being a long way away, aren't the driver and passenger seating positions located further inboard giving more shoulder room and making the distance to the gearstick relatively the same. If it isn't there is nothing to stop one bending it a little and adding an extension, it's what we used to do with the stubby 80" gearsticks.

