[scorpio_rocks]

Looking at the vehicles you mention shouldn't this be in the WWII forum?
(EDIT: sorry now noticed its there too)

There IS a difference in speed and bog-down chance between AWD vehicles and those without. (Difference between Move Class 2 - Wheel and 3 - A/T Wheel)

Many of the vehicles you mention ARE in the game! (some don't mention their maker and are generic) - ie USA 2 1/2 ton 6x6 medium truck unit #038.

AFAIK the game does take into account the reduction in speed for cross country and further for rougher terrain. The "cross-country" speed of units is never stated just the max road speed which is used by the game to calculate speed in different terrain for different move classes... (if you have counted hexes available to move in the game you are not taking lots of variables into account).