A driver trainee works with an employer to gain the knowledge and experience necessary to haul freight and operate tractor trailers. It usually involves the training you need to get a commercial driver's license (CDL). The process varies with the company, but it typically includes a combination of classroom time, safety coursework, and on-the-job route driving. Depending on the materials you carry, your duties may also involve earning additional license endorsements, such as hazardous material (HAZMAT). Your responsibilities may also be to load and unload trucks. You also have to record your work hours as per state and federal regulations.