This is an articulated dump truck used in mining and road construction. My husband is currently operating an excavator on a major road upgrade on the Cardwell range, about 120km from home.
The truck driver drove through a metre deep hole filled with mud on one side and over rock on the other side which unbalanced the tray and tipped it over.
It is designed with the safety feature that if the tray rolls the cabin doesn’t.
As they are designed with this feature, it is a relatively simple procedure for the excavator driver to hook the excavator bucket over the side of the tray and pull it back onto its wheels.