I don't think trucks are really needed.
Look at the other factions: Brits have them only as command-trucks and US, WH + PE rely on halftracks, real trucks like Opel Blitz or that Deuce are only represented in the SP missions.
Eastern Fronts wants to add new factions without breaking general gameplay, therefore I think the Ostheer shouldn't have trucks, too. (Besides for HQ-trucks, of course, but not for transport.)