CARMILA police are working closely with the forensic crash unit to determine how Wednesday morning's fatal truck smash near Ilbilbie unfolded.

A spokesman from Carmila station said police were still trying to contact some members of the dead man's family. He said police were not ready to release the victim's name.

Greg Thurtell is Rockhampton branch manager of McAleese Transport, the company the man drove for.

Mr Thurtell said his employee was a gentleman and "well-liked."

"He was old-school, came to work and went home. He never caused a fuss," he said.

"It's just a tragedy."

Witnesses said one of the B-double trailers had swung into the cabin of the southbound low-loader, killing the driver instantly.

The driver of the second truck, who was admitted to Sarina Hospital suffering from shock, was released yesterday, a hospital spokeswoman said.