Trucking companies can be held responsible for a person's injuries under a variety of circumstances. The truck driver may be in the course and scope of his employment. The trucking company may own the truck. The trucking company may have hired a driver who's not qualified to drive that truck. The trucking company may not have performed necessary maintenance and inspections on the truck. The trucking company may have put undue pressure on the driver to drive for too many hours. The trucking company may have known the truck driver was not creating accurate logs of his driving and allowed him to do that anyway. There're many possible ways a trucking company can be held accountable.