[Isto]

I like to think about those as an abstract element compared to a single PBEM Meeting Engagement battle, that the supply lines are not shown on the map and both players have some presence on the map already.

So artillery pieces, Flak guns, AT guns and so have already been transported before the battle and their transportation are not necessarily shown in the field.

But when thinking about the ammo loadouts, artillery over 80mm should only move after deployment by using transports.