Mr Hickey worked for Hawke Equipment Ltd, a sub-contractor to Seymours Transport Services from Opotiki.
He had only just started with the company.
"The accident happened on his second day of work with them," Carla Seymour said.
"Basically at this stage we cannot comment on the accident, as no one knows what has happened because there are no witnesses.
"We offer our condolences to Dallas' partner Julie and their families," she said.
The rig sustained damage to the right hand side of the driving compartment.
It has been examined and photographed by police serious crash investigators.