@Young:
Is it not a safe assumption that the mechanized infantry represents an infantry already on board?, is this not how a mech infantry (basically a vehicle) gets it’s initial attack and defense punch?… I’m all for mech infantry “vehicles” towing an artillery unit, but only in the non combat movement phase IMO.
I agree with your assumption on the mech carrying an automatic inf in order for it to get a A or D value roll. As long as it also gets a +1 on A from an Art. If you want it to tow an Art in combat it should C5.
I rather see and use a normal Truck-Transport.
A0 D0 M2 C5 (ES@1?) Transports 2 inf only in non combat. Can take as casualty.
Best to use if you dont have Railroads in your game.
YG has Trainstations in his Deluxe game where you can move any 3 pieces 3 spaces from a Trainstation only.