Cloncurry police sergeant Matthew Hows said police believed the speed the vehicle was travelling may have been a factor in the accident, but it was only a suspicion in the early stages of the investigation.

The road train overturned at the intersection of the Landsborough and Flinders Highway, killing the 49-year-old male driver.

A witness said it had taken emergency services nearly 10 hours to cut the body from the wreckage.

Sgt Hows said the truck was put back on its wheels on Monday morning and was loaded on to a truck to be transported to a QPS mechanic for a forensic crash investigation.

"We have yet to determine whether there were any mechanical issues with the truck," Sgt Hows said.

Crash scene photographers have attended the site and tyre marks and road gouges would be investigated.

Mr Hows said the driver's next of kin had not been notified so little information was able to be released.

"Due to the nature of the crash, there will be an autopsy of the body, and the forensic crash unit are still investigating the accident," he said.

The driver's last known break was an overnight stop at Tambo.

Sgt Hows said the first trailer of the truck was piggybacking an empty trailer and the second trailer was carrying aluminium sheeting.

"It was a fairly light load," he said.