St John Assistant Director of Operations Tony Devanney said the vehicles were "smaller and nimbler" than a traditional ambulance.
"They are ideal for narrow roads, difficult terrain and St John first responders working outside metropolitan areas."
He said the shorter job cycle times mean volunteers can remain in their local communities and have greater flexibility.
Contributions from donors around the country have made the delivery of these
vehicles possible.
He said fundraising had played an essential part in getting the new fleet on the road.
Up to another 60 vehicles will be rolled out over the next two to three years.
An open day will include a blessing and dedication for the new vehicles and a tour of the Murupara station.
A morning tea and sausage sizzle will be held with a chance for attendees to chat with volunteers who will be responding in the new vehicle.