We usually went pretty small. 5-7 PCs, maybe a couple of NPCs to fill out skills (i.e. if none of the PCs wanted to be a mechanic). Once ran with a local Polish Free Army liaison as an interpreter and guide. Was a good way for the GM to feed information and drive action.
That means maybe two vehicles. A hummer and a LAV-25 are a nice pair. They have decent abilities, but don't make the PCs invulnerable. They still need to run from real opposition. And you can run a still and tanker trailer, one on each.
Also did this once with the PCs just on horseback. Really limits the amount of stuff they can carry, but keeps them fairly mobile and keeps the profile down. Ran into some issues as I don't personally know that much about horses, but if you do can be a nice twist.
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