"We have a vehicle that is incinerated and we've got a number of corpses in that car," he said.
The force of the crash pushed the car about 40 metres before the truck rolled on top of it and both vehicles burst into flames.
The Beckett family lived in the small town of Poowong, 111 km from Melbourne, with Stephen and his wife Jade working in a dairy.
The incident has devastated the small local community.
“It was very difficult for everybody and to know that a whole family has been wiped out, all but one, in a situation like that,” Bill Loughridge, co-owner of the farm where the Becketts worked, told Fairfax Radio 3AW.
“Well, it has devastated all our workers,” he said.
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