[Raellus]

I think a convoy escort unit (with gun trucks of course) would make for an interesting PC group. It would work great for the Escape from Kalisz module- it's on its way to resupply part of the 5th when the Soviet counterattack hits. You could do this for pretty much any unit you choose. A convoy following the wayward 8th ID would work well too.

It would provide a group of relatively low-powered (combat skill-wise, at least) PCs with a good amount of mobility and firepower.

Do they charge to the rescue with much-needed fuel and tank ammo?

Do they head for the hills in classic EFK fashion?

Do they try to set themselves up as a local power?

A force of gun trucks would also make for an interesting NPC encounter for a more conventional EFK group. "Sorry guys, we don't have any 5.56 or 7.62mm but we have a shit-ton of 120mm AP..."

A rogue gun truck unit could also make for a nasty group of marauders...