J.B. Hunt Transport Services is a leader of the pack. Its intermodal unit, the company's largest, maintains some 2,200 tractors and 40,000 containers and moves customers' cargo by combinations of truck and train. J.B. Hunt's dedicated contract services unit supplies customers with drivers and equipment; it operates about 4,000 company-controlled trucks. The company's truckload transportation unit, which has a fleet of about 1,700 tractors, provides dry van freight transportation service in the US, Canada, and Mexico. A fourth business segment, integrated capacity solutions (ICS), manages freight transportation via third-party carriers as well as J.B. Hunt equipment.