Is it money-saving or life-risking to sleep on the hammock under the truck?  

Mr. Xiang saw a women of 30 years old sleeping on the harmmock under the container-truck by the road side. It is said the the drivers always stay up at the night and sleep in the morning. It is common to find the drivers or their relatives to sleep on the hammock under the truck in the daytime in order to save money and prevent fuel from leaking.
some passers-by said that it is dangerous to sleep under the truck. It's not long ago that one driver was crushed by the car slide resulted from the insecure brake when he fell asleep under the truck. This time, if the driver started his truck when he was unaware of the condition or when the brake is out of control, there will be nothing to pay for the woman.
Have you ever seen this dangerous thing? Please make an analysis, is it money-saving or life-risking to sleep on the hammock under the container-truck?