"It started slowly, then caught fire, flames got really high.
"The only option was to clear people away."
They were able to remove the vehicle's battery and pull out bags before flames appeared.
"It's a shame for me. I was very proud to show my visitors the view. It's a shame that's when it happened."
The incident left Mr Notoa, son AJ and three others stranded on the peak as they waited for a taxi, which was called by police.
Mr Notoa had had no other problems with the van, which he had used to transport guests and take his eight children to and from school for the past three years. "It could be worse. None of my kids were in the van, thank God for that."
Insurance would cover any cost incurred by towing the charred remains and help to buy a new family friendly vehicle.
Chief fire officer Rod Triplow said fire investigators were still unsure what had caused the fire.
"We have been to all sorts up here."