Truckload freight carrier Landstar System has hitched its star to an asset-light business model. The company's fleet of about 13,000 trailers (including flatbed, refrigerated, and standard dry vans) is operated primarily by independent contractors, and the company's services are marketed by sales agents. Landstar's freight carrier units transport general commodities and goods such as automotive products, building materials, chemicals, and machinery, as well as ammunition and explosives. Customers include third-party logistics providers and government agencies such as the US Department of Defense. In addition to truckload transportation, Landstar offers logistics and warehousing services.