Marten Transport, Ltd. operates as a temperature-sensitive truckload carrier for shippers in the United States, Canada, and Mexico. It operates through four segments: Truckload, Dedicated, Intermodal, and Brokerage.

Heartland Express, Inc., together with its subsidiaries, operates as a short-to-medium haul truckload carrier in the United States and Canada. It primarily provides nationwide asset-based dry van truckload service for shippers from Washington to Florida and New England to California; and temperature-controlled truckload services.

Universal Logistics Holdings, Inc. provides transportation and logistics solutions in the United States, Mexico, Canada, and Colombia. It offers truckload services, which include dry van, flatbed, heavy-haul, and refrigerated operations; domestic and international freight forwarding, and customs brokerage services; and final mile and ground expedite services.

Schneider National, Inc., together with its subsidiaries, provides surface transportation and logistics solutions in the United States, Canada, and Mexico. The company operates through three segments: Truckload, Intermodal, and Logistics.

Covenant Logistics Group, Inc., together with its subsidiaries, provides transportation and logistics services in the United States. It operates through four segments: Expedited, Dedicated, Managed Freight, and Warehousing.

Werner Enterprises, Inc., a transportation and logistics company, engages in transporting truckload shipments of general commodities in interstate and intrastate commerce in the United States, Mexico, and internationally.

Old Dominion Freight Line, Inc. operates as a less-than-truckload (LTL) motor carrier in the United States and North America. It provides regional, inter-regional, and national LTL services, including expedited transportation.

ArcBest Corporation provides freight transportation and integrated logistics services. It operates through three segments: Asset-Based, ArcBest, and FleetNet. The Asset-Based segment transports general commodities, such as food, textiles, apparel, furniture, appliances, chemicals, nonbulk petroleum products, rubber, plastics, metal and metal products, wood, glass, automotive parts, machinery, and miscellaneous manufactured products through less-than-truckload services.

P.A.M. Transportation Services, Inc., through its subsidiaries, operates as a truckload transportation and logistics company in the United States, Mexico, and Canada.