A rig driver, also known as a HAULER, is a professional who operates a large truck to transport goods and materials. They are responsible for ensuring that the cargo is safely loaded and unloaded, and that it is delivered on time and in good condition. Rig drivers must have a valid commercial driver's license and must be knowledgeable about the rules and regulations of the road. They must also be able to navigate difficult terrain and hazardous weather conditions.