This is a concept for unit event, something silly who appear from the battle bus of Tunisia, it should be br 1 or br 2 at max, the clasic 20k event with X unit and everyone could have it:
Italy
Japan (if you fear it’s too weak, we can add an armored car)
Germany
Americans
Red Army (Soviet/Rusia)
British
I know, I am just sharing concept and mocking a bit devs for the silly jeep idead they did
but this is not armored car, they are trucks and buses 
Ah sorry for this Misunderstanding 
no problem my friend <3
But those Busses will they work like the Studebacker and SD Kfz 251?
Those are Armored Cars, he Suggested about Busses and Trucks but if you want to have Armored Cars you can find it via here
But you have to Scroll up
This looks more like an advanced APC variant that could be added to the tech tree.
It has firing ports, allowing infantry to fire outwards while protected by armour.
Still, it is somewhat different from armoured cars.
At minimum, it should be armed with a small‑calibre cannon or heavy machine gun for self‑defence.
