Hey all, love what is being discussed so I thought I would offer my Australian input.
NSW Ambulance have Special Operations (Rescue Trucks and Utility Vehicles), Operation Commanders (basically Fly-Car like Supervisors), Intensive Care Paramedics (Use normal Ambulances, better training) and Extended Care Paramedics (ECP, use smaller vans that are not designed to transport patients to hospital).
Our standard Ambulances are ALS so I'm considering that I may have to use BLS for my Extended Care Paramedics, addition of mental health calls (something that is responded to frequently IRL) that take some time to complete and is also something I would consider implementing for BLS/ECP. We also have Rapid Response Units (Fly-Cars and Motorcycles).
On the topic of mobile emergency doctors, we have those on board helicopters, however, there is always an ambulance available for emergency doctors if using a helicopter is not practical.
Below are some photos, I think these would really benefit the EMS side of callouts and work for the US, UK and AUS. I hope this was helpful.