Flatbed Freight

Flatbed freight refers to cargo transported on an open, flat platform trailer with no sides, roof, or enclosed walls. Unlike dry van shipping, which uses a fully enclosed trailer to protect cargo from weather and theft, flatbed transport leaves cargo exposed and accessible from all sides. This open deck design makes it ideal for oversized cargo, heavy equipment, and construction materials that cannot fit through the rear doors of a standard enclosed trailer. Flatbed trucking is commonly used when loads must be loaded or unloaded from the top or sides using cranes, forklifts, or other equipment. The tradeoff is that cargo must be properly tarped or secured to handle road and weather conditions.

Open deck freight is a broad category that includes any shipment transported on a trailer without enclosed walls or a roof. Flatbed trailers are the most common example, but the category also covers step deck trailers, drop deck trailers, lowboys, and double-drops. Open deck freight is the preferred choice when cargo is too tall, too wide, or too heavy for enclosed equipment. Industries such as construction, energy, agriculture, and manufacturing regularly rely on open deck freight to move structural steel, prefabricated components, industrial machinery, and military equipment. Because loads are exposed, proper tarping, strapping, and tie-down practices are essential for compliance and safety.

A flatbed truck is typically required when cargo exceeds the interior dimensions of a dry van, cannot be loaded through a rear door, or must be lifted on and off from above or the side. Common freight categories include construction materials like lumber, steel beams, and concrete forms; heavy equipment such as excavators, generators, and transformers; prefabricated building sections; wind turbine components; military equipment; and large industrial machinery. Agricultural equipment and oversized manufactured goods are also routinely moved on flatbed trailers. Any load that is irregularly shaped, extremely dense, or dimensionally non-standard is a strong candidate for flatbed transport rather than enclosed or standard trailer options.

A step deck trailer, sometimes called a drop deck trailer, features two deck levels: a shorter upper deck near the cab and a lower main deck extending to the rear. The step down in deck height allows cargo that would exceed legal height limits on a standard flatbed to be transported without requiring special height permits. Step deck trailers are commonly used for tall machinery, large vehicles, construction equipment, and industrial components that sit too high on a flat platform. The lower deck typically offers around 10 inches more clearance than a standard flatbed trailer, making step deck trailers a practical solution for shippers who want to avoid the cost and complexity of oversized cargo permitting.

Drop deck trailers is a term often used interchangeably with step deck trailers, referring to equipment where the deck drops below the level of the kingpin to create additional vertical clearance. In some contexts, the term also extends to double-drop or lowboy configurations, where the deck drops a second time between the axles to achieve even lower ride heights. Drop deck trailers accommodate tall construction equipment, industrial machinery, and heavy components that cannot legally travel on a standard flatbed without special routing or permits. Flatbed trucking companies use these trailer types to keep loads within legal height thresholds while still handling cargo that would be impractical to transport in an enclosed environment.

A standard flatbed trailer rides at a fixed deck height, typically around 60 inches from the ground, and is suited for cargo that fits within standard legal height limits. A lowboy trailer features a dramatically lower deck height, often as low as 18 to 24 inches, achieved through a double-drop design that positions the load between the front and rear axle groups. This configuration is reserved for extremely tall or heavy equipment, such as large cranes, industrial boilers, or oversized construction machinery, where even a step deck trailer would not provide sufficient clearance. Lowboys are considered specialized heavy haul equipment and typically require oversize or overweight permits, as well as careful route planning to avoid low bridges and weight-restricted roads.

Flatbed freight shipments in the United States are governed by Federal Motor Carrier Safety Administration regulations under 49 CFR Part 393, which establish minimum standards for tie-downs, anchor points, and working load limits. The number and type of securement devices required depends on cargo weight, dimensions, and the nature of the load. Common methods include chains, straps, binders, and edge protectors, often combined with tarps for weather protection. Flatbed carriers are expected to follow industry safety practices, including pre-trip inspections and mid-route securement checks. Cargo-specific rules apply to items like metal coils, lumber, and machinery. Shippers should work with experienced flatbed trucking companies to ensure compliance from the point of loading.

When oversized cargo exceeds legal dimensional or weight thresholds, one or more state permits are required before the flatbed transport can proceed. Standard legal limits in most states are 8 feet 6 inches wide, 13 feet 6 inches tall, and 53 feet long, with weight limits governed by bridge formula calculations. Loads that exceed these thresholds need oversize or overweight permits, which vary by state and must be obtained for every state the shipment passes through. Some moves also require pilot cars, escort vehicles, or law enforcement escorts, particularly for extremely wide or tall loads. Innovation in permit management software has made multi-state permit coordination more efficient, though the process still requires precise measurement and route surveys for complex heavy haul moves.

Hot shot trucking is a form of expedited freight service that uses medium-duty trucks and smaller flatbed trailers, such as gooseneck or bumper-pull flatbeds, to move time-sensitive or smaller loads that do not require a full-size flatbed truck. It is commonly used in the oil and gas, construction, and agricultural sectors when a partial load needs to move quickly and a full truckload is not justified. Hot shot trucking operates on many of the same principles as standard flatbed trucking, including open deck loading, load securement requirements, and permit obligations for oversized cargo. It represents one part of the broader flatbed carrier landscape, alongside full-size equipment operated by larger flatbed trucking companies.

Construction is one of the heaviest users of flatbed trailers, regularly shipping structural steel, precast concrete, roofing materials, and heavy equipment to job sites across the nation. The energy sector depends on flatbed transport for wind turbine blades, generator sets, pipe, and refinery components. Agriculture relies on flatbed trucking for combines, tractors, and large irrigation systems. Manufacturing facilities use flatbed carriers to move industrial machinery and fabricated metal structures that cannot fit in enclosed trailers. Military equipment moves, including armored vehicles and tactical hardware, also fall under flatbed and heavy haul operations. The breadth of industries that depend on this mode reflects how central open deck freight is to the broader supply chain.

Tarping protects flatbed freight from rain, road debris, and contamination during transit, and it is often required by shippers, receivers, or commodity type rather than federal mandate. Certain cargo categories, such as finished metal products, electronics, and paper goods, are almost always tarped to prevent weather damage. Steel coils and machinery may not require tarping but must still be thoroughly strapped and secured. Flatbed carriers are generally expected to carry and professionally apply tarps as a standard part of service. Drivers who are trained in proper tarp application and securement help ensure on time delivery of cargo in acceptable condition. Shippers should clarify tarping requirements at the time of booking to avoid delays at origin.

Flatbed freight is typically moved on a full truckload or volume basis rather than through the class-based rating system used for LTL shipments in enclosed dry vans. Because flatbed trailers are booked by the load rather than by freight class, shippers are charged based on factors such as trailer type, mileage, weight, dimensions, and any permit or escort requirements. Oversized or overweight loads carry additional costs tied to permitting, route surveys, and escort vehicles. Heavy haul moves may also involve specialized equipment fees. Shippers who are personally engaged in planning their loads from the outset, including providing accurate dimensions and weight data, tend to experience fewer delays and cost surprises throughout the shipment lifecycle.