Should this new unit be considered? 35
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A suggestion of mine which is certainly needed in this game (in my eyes at least...) - a hazmat engine
Many agencies across the world have none or very few dedicated hazmat trucks. Instead, they tend to have standard engines which are equipped with hazmat capabilities. Similar to how rescue engines work in the game - you can have one and the game sees it as a heavy rescue and a normal fire truck.
Getting hazmat resources to calls can often be quite time consuming. Particularly if you are basing your game off of a real agency and they don't exactly have too many of them.
Having such a unit would stop such issues..!