Yo.
How about giving unarmed cars a very, very minor combat capability?
Like ramming folk in combat. Realistically you wouldn't be parked there and just take it.
I say give them some dmg to deal to ppl, make it not a lot to keep it somewhat fair and to not turn them into the newest meta for combat. Make it take the driving skill I guess.
Make it available for AVs, too, the ramming. But make it considerably harder to do and make them crash upon failure.
