MCU
The capacity of the mass casualty incident vehicle is decent, but very little in comparison to how many patients an IRL full size MCI bus can transport. Typically the number of patients range from a minimum of 12 and a max of 18 patients. For people who have fairly large counties and a lot of ambulances coming from a single company across the county, an MCI bus’ capacity is a big deal. For any questions about the accuracy of my numbers, you can refer to San Francisco Fire department’s MCI buses and alameda county ems agency’s bus (all were donated by bus companies)
Platform Truck
In addition, a bit smaller tweaks to personnel in specific units, I feel like the platform truck should allow a max of 4 personnel. There are a lot of departments that do staff 4 people on a truck. Maybe not as much as those who staff 3, but it’s still a good amount. Adding this would not only help missions go a bit faster, but it can fulfill technical rescue requirements (usually 4 trained personnel are required)
Rescue Ambulance
For the rescue ambulance, it should be decreased to 2 personnel minimum. I know of some departments that have paramedic rescues, and they only have 2 personnel running out of it, which makes sense.
Type 5 Wildland Fire Engine
And lastly, the Type 5 engine. The maximum should become 3-4 since many type 5s are crew cabs.