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Dunedin man Ken McHoull, who saw the crash, said it could have been much worse.
"The truck just picked this Prado wagon up like a toy."
A police spokeswoman said they were called to the crash about 2.45pm, near Pigeon Flat Rd.
It had blocked the southbound lane and caused traffic delays.
Mr McHoull said he was following a Toyota Prado wagon and tanker up the hill on the three-lane road north of the city.
The crash between the Prado and tanker happened where the two lanes merged into one and the Prado, which was travelling north, rolled two times across the southbound lane.
"It was pretty scary to watch.
"Lucky there were no cars coming the other way."
He said it was also lucky that the vehicles seemed to be travelling below the speed limit.
He immediately called 111 and asked for an ambulance.
St John spokesman Gerard Campbell said a patient was assessed and treated at the scene, but did not need to be taken to hospital.