There are usually multiple parties involved, not just the driver and the trucking company.
If you were to file a lawsuit for your Atlanta truck accident, you most likely would not only have to sue the driver, but also the driver's employer, the truck manufacturer, the owners of the cargo being transported, and whoever else may be involved.
Additionally, these trucking companies usually have big insurance policies with much higher policy limits than the average driver due to the nature of how dangerous a wreck with a large truck can be.