Haven't seen this suggested anywhere else, but thought I would suggest a "tab" in the dispatch page for each category of vehicles. There is already "ALL, Fire Trucks, Other Fire Trucks, Wildland, Police, FBI, Ambulance, etc.,
Instead of Other Fire Apparatus Could that tab be split?
And the Ambulance one be split
This would allow you to go from tab to tab for selections instead of having to sort through dozens of various apparatus to find the close unit of what type you needed.