Rommel SW of Arras 10/21/1940 Scenario

[Imp]

Most of the time i've found ammo is adequate for most units in any battle,but sometimes may have a few cheap ammo truck/wagons around for low-loadout units just in case.

I must be doing something wrong, arty is often a problem certainly in WW2 due to battles normally taking longer. Also WW2 being more infantry based find armoured cars often run out of ammo for MGs despite the loadout so can infantry MGs. Several tanks SPGs have problems to late war Russian or even T-28s if you can keep them alive come to mind, T-28 its more because they keep missing
MBT its SAMs, ATGMs GLs & hellos that are the main problems.
Sometimes keeping everything firing becomes a little sub game all on its own deciding priority & if defending moving units to cover the hole as you pull out a unit for resupply