Just other smaller unit to do the smaller call so you don't have to send a bigger unit out and you can add new call out Traffic Control, also maybe you can do joint calls with EMS just a thought
What do you mean by squad? Because Rescue Engines exist and Heavy Rescues and Utilities can already clear tree calls
What about Utilities also being able to do carbon monoxide alarms and smoke detector checks as opposed to using an engine. That way it would free up an engine and have more uses for the utility.