You are correct.
There are numerous vehicles that can act as dual-purpose in this way:
FIRE
Quint - Engine and a Platform
Rescue Engine - Engine and an HRV
Mobile Command - Batallion Chief and MCV
Pumper-Tanker - Engine and Water Tanker
Type 3 Engine - Structure Engine and Bushfire Engine
EMS
EMS Rescue - HRV and an EMS Fly-Car
HAZMAT Ambulance - HAZMAT and ALS Ambulance
EMS Fire Engine/Ambulance - Firetruck and ALS Ambulance
Tactical Ambulance - Patrol Car (non-prisoner transporting) and ALS Ambulance
EMS Mobile Command - EMS Chief and EMS Mobile Command
ALS Rescue Ambulance - HRV and ALS Ambulance
POLICE
K-9 Unit - Patrol Car (non-transporting) and K-9
SWAT SUV - Patrol Car and SWAT
Sheriff - Patrol Car and Sheriff
I think I got them all.
Cheers,
just to add a few things - if you do use the hazmat ambo - you will need to train at least one other person in Hazmat- most call need 4 staff- the ambo only carries 3 .
And be careful of the ambo combos- they might transport before the call is completed- then you will need an additional unit to finish the call
Aldo the Fire Investigation unit can act as a patrol car that will transport too