YOU DON'T NEED TO PUT TRUCKS ON THE BATTLEFIELD. YOU CAN PUT THEM IN THE BASE WHERE THEY WILL BE SAFE FROM MOST ARTILLERY
Other than call in's, also not versus an opponent who is smart enough to build their artillery pieces outside their base.
Regardless saying OKW should make their trucks in their base is like asking a Soviet player to refuse to reinforce his squads past 4, or ask a USF player to refuse to decrew his own tanks for repairs.
Making trucks outside the base is extremely necessary for OKW; don't act like it isn't.
And I mean why would someone ever even say something like....?
4vs4
P
2
2
.500
4
+ 1
0
1
oh........OH