Flatbed Trucks

Flatbed trucking is freight transportation on open-deck trailers — trailers with a flat cargo surface and no enclosing walls or roof. The open configuration allows cargo to be loaded from the sides or from above and permits freight with dimensions that would not fit through the doors of a closed trailer.

The service is used primarily for industrial and construction freight: steel, machinery, building materials, pipe, large fabricated components, and equipment. Because loading does not depend on dock infrastructure, flatbeds serve fabrication yards, job sites, mines, and plants that have cranes or forklifts but no dock at all. Open-deck freight also carries obligations an enclosed load does not, chiefly cargo securement and, for many commodities, tarping.

A flatbed trailer is a semi-trailer consisting of a level deck mounted on a frame and axles, with no sides, roof, or doors. Standard versions are commonly built at 48 or 53 feet long and about 8.5 feet wide, with the deck sitting several feet off the ground. Decks are typically wood or a combination of wood and steel, with rub rails and stake pockets along the edges for securement.

The trailer's simplicity is what makes it versatile. Anything that can be lifted onto the deck and secured properly can be transported, subject to legal dimension and weight limits. Deck height is a key planning number, because the legal height limit applies to the vehicle and cargo together — meaning the taller the deck, the shorter the cargo can be before permits are required.

Flatbeds carry freight that is heavy, oversized, irregularly shaped, or simply easier to load from the side or overhead. Common categories include structural steel, rebar, pipe and tubing, lumber, precast concrete, machinery and machine tools, generators, transformers, tanks and vessels, construction equipment, utility poles, and crated industrial components.

The practical requirements are that the freight fit within legal dimensions or qualify for permits, that it can be secured to the deck safely, and that it tolerates exposure to weather or can be tarped. Freight that is fragile, requires temperature control, or is best protected from public view usually belongs in an enclosed trailer. Very tall loads may exceed height limits on a standard deck, in which case a step deck or double drop is the appropriate equipment.

A step deck, also called a drop deck, is a flatbed trailer built with two deck levels: a shorter raised section over the trailer's front, which sits above the tractor's fifth wheel, and a longer main deck that drops down closer to the ground behind it. The lower main deck is the reason the trailer exists.

Because overall legal height applies to the vehicle and cargo combined, lowering the deck by roughly a foot and a half allows correspondingly taller freight to travel without an oversize height permit. Step decks are heavily used for machinery, tall crated equipment, and construction components that would sit too high on a standard flatbed. Many are equipped with ramps, allowing wheeled or tracked equipment to be driven onto the lower deck.

An RGN, or removable gooseneck trailer, is a specialized heavy-haul trailer whose front section detaches and lowers to the ground. With the gooseneck removed, the front edge of the deck rests at ground level, forming a ramp that self-propelled equipment can be driven directly onto rather than lifted.

RGNs also carry a very low main deck, which accommodates tall freight, and they are frequently built with multiple axles to distribute heavy loads across a longer footprint. They are the standard equipment for moving excavators, dozers, loaders, cranes, and other large mobile machinery. Capacity varies substantially with axle configuration, and heavier loads commonly require permits, route surveys, and escort vehicles.

The difference is enclosure, and it changes nearly everything about how freight is handled. A dry van is a sealed box loaded through rear doors at a dock, typically by forklift working from inside. A flatbed is an open deck loaded from the sides or from above by crane or forklift, with no doors and no dimensional constraint from a roof or walls.

Dry vans protect cargo from weather and view, which suits packaged and palletized goods. Flatbeds accommodate freight that is too large, too heavy, or too awkwardly shaped for an enclosed trailer, and they can be loaded anywhere a lift is available rather than only at a dock. The trade-offs are exposure, which tarping addresses for many commodities, and the additional labor and regulatory requirements that come with cargo securement.

Securement uses tie-downs — most commonly nylon or polyester straps for lighter and finished goods, and chains with load binders for steel, machinery, and heavy equipment. Tie-downs anchor to rub rails, stake pockets, or D-rings and are tensioned to hold the cargo firmly against the deck. Edge protectors prevent straps from being cut on sharp corners, and friction matting increases resistance to sliding.

Federal rules set requirements for the number and aggregate working load limit of tie-downs based on cargo weight and length, with commodity-specific rules for items such as coils, pipe, and machinery. Blocking, bracing, and bulkheads prevent forward movement under braking. Drivers must inspect securement shortly after departure and periodically thereafter, since loads settle and straps lose tension over the road.

Oversized freight exceeds the standard legal dimensions permitted for travel without special authorization. General thresholds in the United States are roughly 8.5 feet in width, about 13.5 to 14 feet in height depending on the state, and length limits that vary by configuration. Freight beyond those figures — or beyond standard weight limits — is classified as over-dimensional or overweight and requires permits.

Limits are set by each state, so a load may be legal in one jurisdiction and permitted in the next. Oversize movement brings additional requirements: warning flags and banners, amber lights, restricted travel hours, specified routing, and escort vehicles. Planning begins with accurate measurements, since a small error in stated height or width can invalidate a permit and stop a load at a scale house.

Permits are issued by each state the load travels through, and sometimes by counties or municipalities as well, so a multi-state move may require several. Each permit specifies the approved route, the dimensions and weight authorized, valid travel dates and hours, and any conditions such as required escorts or curfews.

Processing times vary from same-day in some jurisdictions to considerably longer where a route survey, bridge analysis, or utility coordination is needed. Superload movements — those substantially beyond ordinary oversize thresholds — can require extended lead time. FullTruckload.com works with carriers experienced in permitted movement and builds the permitting timeline into the transportation plan rather than treating it as a formality after dispatch.

A standard flatbed operating within federal limits generally carries payload in roughly the same range as a dry van — commonly in the 45,000-pound neighborhood, though the exact figure depends on the weight of the tractor and trailer and on axle configuration. The controlling constraint on most interstate routes is the 80,000-pound gross vehicle weight limit for a five-axle combination.

Axle distribution matters as much as total weight on an open deck, because flatbed freight is often concentrated rather than spread across the trailer floor. A dense item positioned incorrectly can overload one axle group while the total remains legal. Loads beyond standard limits move on multi-axle and specialized heavy-haul trailers under overweight permits, with capacity determined by the specific equipment and the states involved.

A Conestoga is a flatbed or step deck fitted with a retractable tarp system mounted on a rolling frame. The covering slides back along the trailer to expose the deck for loading and then closes over the freight for transit.

It is a compromise between an open deck and an enclosed trailer. Cargo still loads from the side or overhead by crane or forklift, but travels protected from weather and out of view without the labor of manual tarping. The rolling frame reduces deck width and height slightly and adds trailer weight, so it does not suit every load. Conestogas are common for finished machinery, painted steel, and aerospace components.

Hot shot flatbed trucking uses smaller open-deck trailers — commonly gooseneck or bumper-pull trailers in the 20- to 40-foot range — towed by heavy-duty pickup trucks rather than highway tractors. It serves loads that need open-deck transport urgently but do not require the capacity of a full-size flatbed.

Capacity is meaningfully lower than a standard flatbed — generally ten to twenty thousand pounds depending on the truck and trailer combination — and dimensional limits are tighter. The advantages are availability and access: hot shot equipment is often easier to source on short notice, and the shorter combination reaches constrained sites more easily. The service originated in oilfield supply and remains common there, along with construction freight.