As I understand it, if you slap a tank in CDDA and do 1 damage to it, that 1 damage is applied, and in theory, you could smack that tank for a few hours and eventually knock the plating off the tank.
The armor system, the same one used by the player and monsters alike could prove useful. Flowers bitch-slapping your car would no-longer rip your headlights off, and it’d probably take more than one zombie to tunnel through a vehicle. Obviously the vehicle’s “Armor” rating would get better with the type of armor you strapped to it. Bone would probably protect from extra zombies slapping it, while Mil-Spec armor should probably stop just about any non-AP pistol round at range, and most rifle rounds at range with minimal, or even no damage done to the armor itself.
Your Military Composite Plating stops the 9mm round!