He was convicted of one change of careless driving causing death following a guilty plea. He was sentenced to three months' imprisonment and disqualified from driving for fifteen months.
Coroner Heather McKenzie said Stewart's death highlighted ongoing issues around the unregulated use of tablets and similar devices while driving.
"In my view, the tablet's placement was a significant distraction and impediment for the driver in terms of overall driving vision, concentration, and safety," she said in a report released today.
"I recommend that Police, WorkSafe, and Waka Kotahi NZ Transport Agency undertake a joint safety campaign regarding the safe use of electronic tablets or other similar devices in vehicles.
Drawing greater public attention to the issue will reduce the chances of further deaths occurring in similar circumstances."
The risks of mobile phone use while driving is currently a focus of various agencies' safety campaigns, and their use is regulated by the Land Transport (Road User) Rule 2004.
NZ Police, WorkSafe and Waka Kotahi (NZ Transport Agency) actively promote safe driving behaviour to all road users.
"As a committed Road to Zero partner, our dedicated road policing staff are out on our roads every day targeting and preventing unsafe behaviour to reduce the number of deaths and serious injuries on our roads," said Superintendent Steve Greally, Director Road Policing.
"Any death or serious injury from a road crash is one too many, especially if it could have been prevented."
There aren't any statistics for the use of tablets and similar devices, despite being commonly used in delivery trucks, courier vans, and recovery vehicles (tow trucks), or as GPS navigation aids.
Road Transport Forum chief executive Nick Leggett said the road is the workplace for truck drivers, so any death involving a truck was felt acutely by the industry.
"Distraction is one of the big contributors to road accidents across the board, particularly involving looking at electronic devices while driving, or having them in the driver's line of sight."
He said the industry would the coroner's findings on board and continue to work with government agencies to raise awareness about the use of tablets and similar devices truck drivers use for work purposes.
"It takes a sustained period of education to change behaviour and we are on board for that."
The delivery driver was working for Kamush Freight Limited, which contacts to Supply Chain Solutions (SCS). The truck was owned by Kamush but had SCS livery on it.
SCS Chief Operating Officer, Jacqui Whaanga, said she and her colleagues were "very saddened" by the tragedy.
The company welcomed the Coroner's findings, in particular, the recommendation for a joint safety campaign highlighting the danger of the use of devices by drivers.
No one from Kamush Freight could be reached for comment.