I think the positions for creating the infantary reinforcement unit in the Freiwillinger Grenadier should be the same for both the first OKW truck and the second. Position [1,1] for example. For the basic infantary unit, the same position could also be used. Position [1,2] for example.
And the construction unit could be moved to another position.
I would like to congratulate you for this great mod and excuse me for my grammar because I’m not native english speaker.