I like the BOTB syle mech infantry with the truck peice. A Truck unit can be bought for 4IPC. It than can carry 2inf or 1inf and 1Art or just 1Art Like a “land” transport. It has know attack or defense value itself. We already have them for U.S. and Germany if you have BOTB. That only leaves USSR and U.K. and Japan. Just paint the U.S. truck U.K. and Russia colors because the U.S. provided many trucks to those countries anyway. Japan never really had much mech inf anyway but you could paint the German one Jap Orange or Jap Red whatever you prefer.
D12 with Expanded Land Units
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D12 version I use in a 1941 variant of HBG Global War:
Incorporates SPA / SPG / Motorized Infantry / Light & Medium Armor / Commander (General).
I use National Advantages to address Heavy Armor (Russia & Germany).
Cost/Move/Attack/Defense
INFANTRY: 3 / 1(2) / 2(3) / 4(6)
Combined Arms: Attack on (3) when supported 1:1 by Artillery or SPA.
Defend on (6) during 1st round of combat when supported by Fortification (10:1).
Move (2) during Combat or NCM when supported 1:1 by Mortorized Infantry.ARTILLERY: 4 / 1(2) / 3 / 4
Combined Arms: Increase Infantry Attack to (3) when supported 1:1.
Move (2) during Combat or NCM when supported 1:1 by Mortorized Infantry.SELF-PROPELLED ARTILLERY (SPA): 6 / 2 / 4 / 4
Combined Arms: Increase Infantry & Mech Infantry Attack +1 when supported 1:1.
Initial Bombardment: On Defense, successful hit results in immediate removal of enemy land unit.
Cannot Blitz.MOTORIZED INFANTRY: 4 / 2 / 3 / 3
Transport (1) Infantry or (1) Artillery 2 spaces during Combat or NCM Move.
Cannot Blitz.MECHANIZED INFANTRY: 5 / 2 / 3(4) / 4
Combined Arms: Attack on (4) when supported 1:1 by SPA or any Armor.
Combined Arms: Blitz when supported 1:1 by any Armor.LIGHT ARMOR: 6 / 2 / 5 / 5
Combined Arms: Increase Mech Infantry Attack +1 when supported 1:1.
Combined Arms 1:1 allows Mech Infantry to Blitz.
Blitz.MEDIUM ARMOR: 7 / / 2 / 6(7) / 6
Combined Arms: Attack on (7) when supported 1:1 by Tac Bomber.
Combined Arms: Increase Mech Infantry Attack +1 when supported 1:1.
Combined Arms 1:1 allows Mech Infantry to Blitz.
Blitz.SELF-PROPELLED GUN: 8 / 2 / 6(7) / 7
Attack on (7) while enemy Armor is present.
Non-Infantry Land unit must be chosen as casualty.
Combined Arms: Blitz when supported 1:1 by any Armor.COMMANDER (General): - / 1 / - / -
Fixed number of Commanders per Nation. If destroyed, replaced on fixed turn schedule by nation.
Coordinated Attack: Provides (1) called shot against any Land unit during 1st round of Combat.
Organized Retreat: Allows Land & Air units to retreat after 1 full round of Combat. No Defense rolled in round 2.