They are coming. I’ve seen Altec utility trucks (think digger derricks and bucket trucks). I work for a truck OEM, and while EV isn’t core business, it will be. The main hurdle is charging infrastructure and for locally based fleets, it isn’t quite the big ordeal. Over the road, yes, but not for those local fire trucks and ambulances, even bucket trucks and other utilities.
I haven't heard anything about charging fire equipment when it's on a scene and runs out of,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,electricity. Long hoses for water, now a truck with extension cords.. Hooked up to what ?