"Back in 2016, I was acutely aware that we needed vehicles in the region that would help us move around in an emergency," he said.
"I personally acquired three Unimog and travelled to Waiouru for a week and a half of driver training before bringing them back to Northland."
When flooding had closed SH10, and slips rendered SH1 impassable, Te Whatu Ora Incident Controller Sarah Hoyle contacted Harris to see if the Unimog could go to Kaitaia to assist with patient transport.
"With the airport closed and helicopters unable to land, we needed to ensure we had something in place should we need to move a patient to Whangārei Hospital," Hoyle said.
"Mita and the Unimog were able to help with home evacuations the evening they arrived, and the following day he transported a patient to a waiting ambulance in Kerikeri through the flooding at Kaeo.
"We are extremely grateful for his support. It has benefited the community of Kaitaia immensely."
Harris said it felt "pretty awesome" to do his part for civil emergency response.
On his way back to Kerikeri after transferring a patient, he was swift to acknowledge the Far North community and his employer, Ministry for Primary Industries (MPI).
"I am very grateful for the support from my boss, who allows me to help out when needed, and the hospitality in Kaitaia was amazing."
Harris said police, FENZ, St Johns, and DHB staff were had gathered to prepare to evacuate people in low-lying areas, and he joined to support them.
"If more rain had come through, we definitely would have had to evacuate people from the outskirts of Kaitaia. And also help transport DHB staff to and from work."
Through decades spent working in environmental protection - at Department of Conservation and currently looking after kauri trees at MPI - Harris said he has seen first-hand how our environment is changing, and preparedness is more essential than ever.
"I've worked in the environment most of my life, and things are changing."
Since Harris acquired the vehicles, he said one had been gifted to Ngāti Kurī for the use of the community, and another to Te Rūnanga-Ā-Iwi O Ngāpuhi as an advocacy vehicle for kauri trees.
Harris said he'd taken responsibility for ensuring the third vehicle remained in good working order.
"Over the years, I've forked out personally to keep it ticking over for these inevitable events."
Harris said he was currently collaborating with several organisations to ensure the support would remain available and up to scratch with the necessary tools.
Rachel Thompson, Kaitaia Hospital's clinical nurse manager, said Harris' support was a relief, and a "great initiative", but echoed his sentiment that work remains to be done to ensure emergency transport meets medical requirements.
"When we're isolated like that and run out of equipment or stores, we're out," she said.
"We stock enough to get us through a long weekend, but beyond several days we would have an issue.
"Or if there were an influx of a certain type of patient with a specific requirement - say tubing for machines for people with breathing difficulties - that would be an issue.
"Having Mita meant we didn't have to go without anything - like drugs from the pharmacy, dressings, and other medical supplies.
"Is it a nurse, or a paramedic? Mita's in a separate cab so he's literally just the driver.
"It put new, different issues on the board for us.
"It's definitely something I'll be raising at our next meeting with St John and the transport part of the DHB."
Thompson emphasised her amazement at how far above and beyond people are willing to go for each other.
"The willingness of Mita and his daughter, and staff here, to do whatever they had to do to look after patients - that's what everyone does in those situations," she said.