Even without any weaponry, just a high mobility armored fighting platform would still be a Game Changer in an otherwise un-mechanized environment. Something open-top like an SdKfz 251 where you pop up to shoot, then hide behind armor plate until you're ready to shoot again.

Heck, even just pickup-truck technicals and supply-haulers would be an advantage against an OPFOR relying on animal musclepower...