I haven’t seen anyone else talking about this, so I suppose this is best place to post.
Water cannons from fire trucks are an early game way to get mounted turrets with infinite ammo. Apply a gunsmithing kit to them to give them +2 damage before you mount them. A couple water cannons on automatic fire, automatic targetting will easily kill zombears at the measly price of over half a 60L tank of water. It… might take them awhile to actually kill a zombear, but they stunlock anyway so it’ll happen eventually!
Even if they didn’t do damage, a vehicle that stunlocks zeds is incredibly useful. Plus the turret fire will alert you to nearby threats you can’t see.
I’m not sure if water cannons dealing damage is intended behavior or not, but I personally can’t imagine high powered water hoses NOT doing at least a little damage. Fire engine hoses are calibrated to fight distant / multistory fires, not nonlethal crowd control, after all.