I dont think a polaris carrier would be sent iso a paramedic.
Or a welfare/command unit.
All HART operatives are paramedics, regardless of what they drive as they are all trained to drive every vehicle.
The HART team typically deploys as one group unless they are utilised for C1 response or 'scouting' to determine if the incident is true MTFA (as I've experienced by them arriving on scene with me) in this case it will be a PRV crewed by 2 paramedics