STuG's are cheap,as fast as PZIV's (same hull and engine) have low profile and most are hard nosed and can deal with most armour within range in this time period.
(They were easily modified thru out the war as no complication with having a turret)
If you don't go high speed of course,use them as an Tank destroyer and SP support on elevated ground, hunker down with a good LOS and get 1-1 or 2-1 armour kill ratio for each one that gets KO'ed should suffice
