The team's adventure included cross-country tracks, ferry rides, main highways, snowy mountain passes and over 100 tunnels.
Mr Hewitt said one of the highlights of the adventures was unexpectedly meeting up with other Kiwis in a small village in Rome.
"We arranged to go to a village in the mountains where we met Malcolm Evans. His father had hid in a cave in the war there. He had flown to be there from New Zealand on that very day.
"It was a bit of an emotional visit. That day turned out to be 70 years to the day since it had been liberated."
Mr Hewitt said they were all treated like kings with food and wine being shared around and speeches being made by local dignitaries.
The second highlight for the journey was being on the beach waiting for the tide to go out on D-Day, he said.
"There were hundreds of vehicles on the beach, tanks, Indian motor bikes, bulldozers and massive trucks, and all our vehicles made it there, all 10 of our vehicles were parked on the beach for D-Day. That was a special moment.
"We had to leave camp at 4am in the morning and we were put into small convoys and we drove into the countryside in the dark.
"As it gradually started to dawn, we were marshalled on to the beach with the jeeps along the front and the dodges along the back.
"The day before had been stormy and windy but that day there was a perfect calm."
Mr Hewitt said there would have been between 300 to 500 vehicles parked up on the beach with almost 15,000 people for the celebrations.
The five New Zealand vehicles have a combined value exceeding $250,000.
D-DAY
• On June 6, 1944, a huge military machine embarked on the invasion of German-occupied France. Its target was the coast of Normandy. A vast armada of ships carried more than 130,000 men. Ahead of them, planes and gliders transported another 23,000. This was the biggest amphibious landing in history, and its aim was to end the war in Europe and bring victory to the Allies.
• Over the following months, further troops landed to help regain German-held territory; their number grew to more than two million.
- Additional reporting Amy McGillivray