Flatbed trailers are versatile vehicles used in many industries. Their open design gives them the flexibility to carry different types of cargo. Whether it’s construction materials, machinery or extra-long, extra-heavy items, flatbed trailers offer an efficient solution.
The different types of flatbed trailers vary in their construction and carrying capacity. They also have different uses depending on the situation. Understanding these differences will help you choose the right trailer for your cargo needs.
Next, we will look at some common types of flatbed trailers and their key features.
What is a Flatbed Trailer?
A flatbed trailer is an open transport deck with no sides or roof, used to carry large, irregularly shaped cargo that cannot fit inside an enclosed trailer. Because the platform has no side or top restrictions, loading and unloading from any side is easy.
Flatbed trailers can carry many types of cargo. They are perfect for loading construction materials, machinery and even agricultural products. Oversized cargo , such as steel or pipes can also be easily transported since there are no walls or roofs.
The Truckman Flatbed Semi Trailer is a strong choice if you regularly transport large items. It is designed to handle extra-long and extra-heavy loads, and is closer to a van trailer only in chassis — unlike an enclosed van, it has no walls to limit cargo shape.
Common Flatbed Trailer Sizes
Truckman offers a range of flatbed trailers to meet a variety of transportation needs. We offer standard 48-foot and 53-foot trailers as well as 45-foot models. These types of trailers provide you with maximum flexibility and efficiency.
The 45-foot flatbed trailers are ideal for transporting shorter lengths that still require a high capacity. The 48-foot and 53-foot trailers are perfect for hauling construction materials, heavy equipment, or extra-long items.Standard decks are about 8.5 feet (2.6 m) wide, which keeps the trailer within the common legal width without a permit.
Whether you need a 45-foot, 48-foot, or 53-foot trailer, we can help you choose the model that best fits your cargo. We also offer customization options to ensure smooth and efficient transportation.
Benefits of Flatbed Trailers
Flatbed trailers for truckers are highly flexible and efficient for a wide range of transportation tasks. Whether you’re transporting construction materials, large equipment or irregularly shaped cargo. Our flatbed trailers can handle it all with ease. Here are some of the main advantages of using a flatbed trailer:
- High Flexibility: The open design of a flatbed trailer has no side or top restrictions. This allows you to load cargo of any shape or size. Whether it’s a long steel beam, a wide machine or something else that won’t fit in an enclosed trailer, a flatbed trailer can provide a solution.
- Large Capacity: Flatbed trailers have a large capacity, making them ideal for heavy loads. We offer 45-foot, 48-foot, and 53-foot models that can transport large amounts of cargo. This reduces the number of trips and increases overall efficiency.
- Easy loading and unloading: Flatbed trailers do not have side or top plates, allowing you to load and unload from both sides. This saves time, especially when loading large items with cranes or forklifts.
- Wide Adaptability: Flatbed trailers are easily adapted to different transportation needs, both short and long distance. They are suitable for a wide range of industries such as construction, agriculture and manufacturing.
Types of Flatbed Trailers
As one of the leading flatbed trailer manufacturers in China, Truckman offers a wide range of flatbed trailers to meet the different transportation needs of our customers around the world. Whether you need to transport oversized, overweight machinery and equipment, or special sized cargo, we have a solution for you. Below are the main types of flatbed trailers we offer and their common size ranges.
Standard Flatbed Trailers
Standard flatbed trailers are one of the most common means of transportation. They are often used to haul construction materials, piping, steel, lumber, and mechanical equipment. With no sidewalls or tops, loading and unloading is quick and easy.
Truckman’s standard flatbed trailers are typically 48 feet (14.6 m) or 53 feet (16.1 m) long and 8.5 feet (2.6 m) wide. These dimensions are ideal for handling most industrial and commercial transportation needs.
Lowboy Trailers
Lowboy trailers (also called low-bed trailers) are designed for equipment that is too heavy or too tall for a standard flatbed. Their low chassis design makes them ideal for carrying heavy machinery such as excavators and bulldozers.
Truckman low-bed trailers are typically between 40 feet and 53 feet in length and between 18-24 inches (45-60 cm) in height. This low height makes it possible to transport taller loads without exceeding legal height limits.
Detachable Gooseneck Trailers (RGN)
Removable gooseneck trailers (RGN) are designed for industries that transport extra-long and heavy loads. The detachable gooseneck lets the deck drop to the ground as a ramp, so equipment can be driven on rather than craned — ideal for large equipment such as construction machinery. Truckman offers RGN trailers from 40 ft (approx. 12.2 m) to 53 ft (approx. 16.1 m), customizable to cargo length.
Drop Deck Trailers
A step deck — also called a drop deck or single drop — has a two-level platform: a higher front deck and a lower rear deck. The lower rear deck lets it carry taller cargo, such as vehicles, machinery, and tall steel, while staying under height limits. Truckman’s step deck trailers typically start around 40 ft.
Double Drop Trailers
The double drop trailer has a very low load platform, making it ideal for transporting extra tall equipment. This design allows for the loading of extra tall loads while lowering the center of gravity for safer and more stable transportation.
Truckman’s double drop trailers typically range from 40 feet to 53 feet in length. They are ideal for carrying heavy machinery, boilers, transformers and other overweight, extra tall equipment.
Extendable Drop Deck Trailers
When you need to transport overweight or overheight equipment, a lowboy trailer is the best choice. Their lowered chassis is perfect for carrying large equipment such as excavators and bulldozers. This design ensures that cargo is transported safely without exceeding height limits. Note that the U.S. has no single federal height limit — state limits commonly run 13 ft 6 in to 14 ft, and individual bridges or tunnels may be lower — so check the loaded height (deck plus cargo) against the actual route.
Truckman offers lowboy trailers from 40 feet to 53 feet, ideal for transporting over-height equipment.
| Type | Typical deck length | Typical deck height | Typical legal freight height | Typical payload (confirm per build) | Best for | Watch out for |
|---|---|---|---|---|---|---|
| Standard flatbed | 48–53 ft | ~58–60 in | ~8 ft 6 in | often ~45,000–48,000 lb, depends on tractor/axles/bridge law | steel, lumber, pipe, crated machinery | loaded height vs route |
| Step deck | 48–53 ft | lower deck ~36–42 in | ~10 ft | varies with axle setup | machinery slightly over legal height | lower-deck usable length |
| Double drop | well length varies | well ~18–24 in | ~11 ft 6 in–12 ft | varies widely with axle count | tall, top-heavy equipment | center of gravity, permits |
| RGN | well length varies | low well + detachable neck | ~11 ft 6 in–12 ft | varies widely, heavy-haul builds differ | drive-on heavy equipment | cost, axle configuration |
| Extendable | extends beyond fixed deck | varies by base deck | depends on deck type | varies | long beams, pipe, blades | maneuvering, permit planning |
We compare these types on loaded height and axle rating, not deck length alone, because two trailers of the same length can sit at very different heights. Every payload figure above is a starting point to confirm against your axle count, GVWR, and bridge law, not a fixed promise.
Related flatbed variants exist for needs this guide doesn’t cover in depth. Conestoga, curtainside, and side-kit trailers add weather protection or side containment to an open deck, and are the right conversation when keeping cargo covered or contained matters more than height or length. We can specify those when weather or containment is the main concern, but for over-dimension and heavy-haul decisions the six types above are the working set.
Matching Trailer Type to Cargo Height, Weight, and Length
Choosing a flatbed type starts from the cargo’s binding constraint — height, weight, or length — not from the trailer catalog, because the constraint that fails a legal limit first decides the deck. Work the variables in order: height first, then weight and loading method, then length, then weather protection.
If loaded height is the binding constraint, move down the deck height: standard, then step deck, then lowboy or double drop. Choose the double drop specifically when a tall load is also top-heavy and needs the low center well for stability. If weight and loading method are the constraints, the question is how the load gets onto the deck. Equipment that must be driven on points to an RGN; heavy but liftable loads can stay on a lowboy or standard deck. If length is the binding constraint, an extendable deck supports over-length cargo end to end rather than leaving it to overhang and flex.
We align the trailer to the most restrictive of these variables, then verify capacity against your axle configuration and route. This guide does not replace a cargo securement plan. When overhang or irregular freight is involved, verify tiedown count and aggregate working load limit under applicable FMCSA and state rules. The federal standard requires the securement system’s aggregate working load limit to be at least half the cargo weight.
Choosing the Right Flatbed With Confidence
The right flatbed type comes down to three variables — height, weight, and length — and to which one fails a legal limit first. Standard decks handle versatile legal-height freight; step decks, lowboys, and double drops step down the deck for taller and heavier loads; RGNs let heavy equipment drive on; and extendables carry over-length cargo without overhang.
In practice, the loads that cause problems are rarely the obvious oversized ones. They are the ones assumed to fit a standard deck without anyone checking the loaded height against the route. We verify that combined height, the axle rating, and the length against your actual haul before specifying a trailer, and we treat any capacity figure as a number to confirm rather than a fixed promise.
To move forward, have your cargo’s height, weight, length, and loading method ready, along with the route’s most restrictive limit and any drawings, photos, or center-of-gravity data. Send those specs and we will align a flatbed type (standard, step deck, lowboy, double drop, RGN, or extendable) to your load, then confirm deck height, axle configuration, and permit-sensitive dimensions before quotation. Contact our team or submit your spec to request a tailored review.
FAQ
What is the most common type of flatbed trailer?
The standard flatbed is the most common type, because its single open deck handles the widest range of legal-height freight. It gives way to a specialized deck only when height, weight, or length crosses a limit.
What is the difference between a step deck and a double drop?
A step deck has one lower rear deck for moderate over-height loads, while a double drop has a low well between two raised ends for the tallest, least stable loads. The double drop trades some deck space for a lower center of gravity.
What is the difference between a lowboy and an RGN?
Both are low-deck heavy-haul trailers, but an RGN has a detachable front that drops the deck into a ramp so equipment can be driven on, while a traditional lowboy is loaded by crane or from the rear. Choose the RGN when the load must roll on under its own power.
How do I know if my load is over the legal height?
Add the deck height to the cargo height and compare the total to the route’s limit, remembering there is no single federal limit, with state limits commonly 13 ft 6 in to 14 ft and individual bridges lower. Because deck height differs by trailer type, the same cargo can be legal on one deck and over-height on another, so we verify the loaded height before recommending a type.
How much weight can a flatbed trailer carry?
A standard flatbed often carries roughly 45,000–48,000 lb, but the real figure depends on axle count, suspension, tractor, and the bridge laws on your route. Treat any single capacity number as a value to confirm for your configuration rather than a guarantee.
Do I need a permit for an oversized flatbed load?
Loads that exceed your state’s legal height, width, length, or weight generally require an oversize or overweight permit, and the thresholds vary by state and route. Confirm the permit requirement and any escort rules before booking, since these depend on the jurisdictions you pass through.
