...
It doesn't has to fit a real unique role, but it would make game look better. At the moment it is a copy-paste game, German fractions and Commanders are too similar.
Only for German fraction we could get (look at other factions too!)
Jagdpanther (could replace a Elefant for a commander, less HP but faster)
Wirbelwind (could replace OKW's Ostwind)
Tiger-II-P (could replace Tiger-Ace for a commander)
StuG IV (could be a Commader unit, replacing StuG III-G, beeing more expensive but more HP and armor)
StuH (could replace StuG-III-E)
Jagdpanzer Hetzer (could replace Jagdpanzer-IV with commander, cheaper but less range)
Hummel (could replace a Ostheer-Commander leFh18)
SdKdfz.-251 AT-gun
50mm PaK39 (could replace Püppchen, so Püppchen could become an unique Luftwaffe-Commander unit)
Kettenkrad
Schwimmwagen
4-ling 20mm FlaK
Nebelwerfer (could replace fire-shells of leIG18 OKW)
88-FlaK-36 (could replace some PaK43-88 guns, less range and DPS but cheaper and less pop)
Motorcycle
Panzerjäger Mader (could be Commander unit, replacing StuG III-G, beeing cheaper, less HP and armor, but faster reload)
SdKfz.-234 20mm-gun
Bergetiger
And with new skins they would still look good.