Would we? There is considerabl evidence that what determined the date was weather and ground conditions not operations in the Balkans. While this has been widely stated the actual evidence is a bit skimply and the weather in particular the mud and river situation is better supported by documents from the discussions I've seen. The numbers I've seen were 10% of the truck fleet used by the Africa Korp. Furthermore it's not clear how many of these were Italian. Of course trucks weren't the main problem in the East by any means. How many weapons did the Germans deliver to the Italians? For that matter how many weapons did the Italians deliver to other Axis powers? Highly unlikely. The rail net is what limited the logistics of the advance. Throwing more units into a logistically limited situation doesn't improve things.