Don't use water in a chemical plant!
Wrong. You need to be trained in chemical fires. There are many cases where water needs to be used.
It depends on what you have. Sodium Hydroxide? Is it powder or aqueous? Titanium shavings? NO WATER! Dumpster fire, perhaps? The Purple K extinguishers are next to the water reactive agents so there is no need for a quick response vehicle like this. Looks cool though. There are way too many Fire Chiefs that would buy one for that reason alone.
Somebody get me a ladder, so I can get down off this horse!