1. What is a flat deck trailer?

2. Main parts of tri axle flat deck trailer

3. Common uses of flat deck trailer

4. How long is a flat deck trailer?

5. How to load a tri axle flat deck trailer?

Tri Axle Flat Deck Trailer FAQ

1. What is a flat deck trailer?

A tri axle flat deck trailer for sale is a semi trailer specifically designed for transporting standard containers. It typically features a three axle structure and is equipped with container twist locks on the frame, which can secure containers of different sizes, such as 20 foot and 40 foot.

Advantages of tri axle flat deck trailer

1. High Load Capacity: The three axle structure of the flat deck trailer for sale allows for more efficient distribution of container weight, reducing the load on individual axles. Compared to two axle models, the three axle structure is better suited for transporting heavier 20 foot and 40 foot containers, meeting the needs of ports, logistics, and long haul container transportation.

2. Good Transportation Stability: The three axle structure allows for more even load distribution, resulting in better stability on highways, long haul transport, and in complex road conditions. A well designed chassis and suspension system reduce vehicle sway during operation, improving the safety of container transportation.

3. Suitable for Transporting Various Containers: Depending on the chassis length and container locking layout, tri axle flat deck trailer for sale can be designed to transport 20FT, 40FT, and even 45FT containers. By configuring different Twist Locks, it can flexibly meet various container transportation needs.

4. High Container Loading and Unloading Efficiency: The tri axle flat deck trailer for sale is equipped with standard container locks, allowing containers to be secured directly after loading using Twist Locks, eliminating the need for additional complex lashing equipment. Combined with port container cranes, reach stackers, or stacker cranes, loading and unloading can be completed quickly, significantly improving logistics efficiency.

5. Robust and Durable Chassis Structure: Tri axle flat deck trailer for sale typically use high-strength steel for their longitudinal and transverse beams, enabling the chassis to withstand concentrated container loads and impacts from long-term transportation. For high frequency usage scenarios such as ports, mining areas, and logistics transportation, the robust chassis structure extends the vehicle's lifespan.

6. Relatively Low Maintenance Costs: Compared to complex dump, hydraulic, or special transport semi trailers, the flatbed structure has a simpler mechanical structure and lacks complex hydraulic lifting systems. Routine maintenance mainly focuses on components such as axles, tires, braking systems, suspension systems, and container locks, making repairs relatively convenient.

7. Suitable for Long-Distance Transportation: The three axle design not only increases load-bearing capacity but also reduces the load on a single axle, making it ideal for long distance container transportation. Whether transporting goods from ports to logistics warehouses or transshipping containers between different cities, the tri axle flat deck trailer for sale offers excellent practicality.

8. Wide Range of Applications: The tri axle flat deck trailer for sale is widely used in port container transportation, international logistics, freight companies, factory raw material transportation, mineral transportation, and cross-border freight. Especially for countries with high container transportation demands, the tri axle flat deck trailer for sale is an economical and practical transportation solution.

9. Flexible Configuration and Easy Customization: Different chassis lengths, axle brands, suspension types, tire specifications, number of container locks, and outrigger brands can be customized according to the road regulations and actual transportation needs of the customer's country. Therefore, the tri axle flat deck trailer for sale can be configured for different markets such as Africa, the Middle East, Southeast Asia, and Latin America.

2. Main parts of tri axle flat deck trailer

1. Main Frame

The main frame is the core load bearing structure of the tri axle flat deck trailer for sale, typically welded from high strength steel, and mainly consists of longitudinal beams, crossbeams, and side beams. The weight of the container is ultimately transferred to the three axles through the frame; therefore, the frame's strength directly affects the tri axle flat deck trailer for sale load bearing capacity and service life.

2. Three Axles

The three axles are an important component of a tri axle flat deck trailer for sale, usually installed at the rear of the frame, used to support the weight of the container and the semi trailer itself. The three axles distribute the vehicle load, improving overall load-bearing capacity and driving stability. Different brands and tonnages of axles can be selected according to customer needs.

3. Twist Locks

Twist locks are a key component that distinguishes tri axle flat deck trailer for sale from ordinary flatbed semi-trailers. Installed in designated positions on the frame, they connect to the corner brackets at the bottom of the container, used to secure standard containers such as 20FT and 40FT, preventing the container from shifting during transportation.

4. Kingpin of tri axle flat deck trailer

The 90 # traction pin represents the diameter of the traction pin is 90mm, and the material is mainly chromium alloy. The tri axle flat deck trailer for sale near me and the tractor are all connected by it. It is connected to the traction seat of the main vehicle and also bears all the traction. It is an important component.

At present, the traction pins on the market are mainly divided into 4 types, assembly 50, assembly 90, welding 50, welding 90, users should choose according to different models and actual use.

5. Suspension of tri axle flat deck trailer

Steel plate suspension is our common leaf spring, its full name is series-connected leaf spring balance suspension. It is mainly composed of leaf springs, suspension bearings (commonly known as lifting lugs), connecting rods, U-bolts and other parts. The longitudinal force of the car body falls directly on an axle. The biggest advantage of this kind of suspension is low price, good reliability and easy maintenance. At present, more than 80% of ordinary tri axle flat deck trailer in China use leaf spring balanced suspension.

The most obvious feature of 40ft trailer for sale air suspension is its airbag-type air spring. The40ft trailer for sale air spring itself is relatively light in weight, the friction of the air medium in the airbag is small, there is almost no noise during operation, and its life is 2-3 times that of leaf springs. However, when an air spring is used, a rod system that can transmit various forces and moments other than the vertical force must be provided, so the suspension structure is complicated; in addition, the air spring has strict requirements for sealing, and its cost is also high.

6. Tri axle flat deck trailer support device

Commonly known as outrigger. Using the principle of "standing timber jacking", it is located at the front end of the tri axle flat deck trailer frame for use after the tri axle flat deck trailer is separated from the tractor. Classification of outriggers: Single-acting outriggers are operated separately on both sides, there are two cranks, and each gear has a car gearbox.

Linked outriggers are made from both sides while operating. There is only one crank, which is composed of one gearbox and one without.

The main components of the outrigger are two-speed gearbox, support sleeve, support rod, drive screw, and the support plate. The structure is very simple and the function is very important.

7. Braking system

Brake air chambers are round metal containers, located at each wheel, where compressed air is converted into mechanical force to apply the brakes and stop the vehicle.

Brake valve is used to control the braking of trucks or tri axle flat deck trailer. It is suitable for flatbed tri axle trailer with dual-line brake system, and parking or emergency brakes are air-braking brakes. It has the function of automatically causing the 20 ft flatbed trailer brake when the control pipe connection of the trailer brake system is broken or leaking.

8. Electrical System

The electrical system mainly includes taillights, turn signals, brake lights, side lights, reflective markings, and electrical wiring, providing lighting and signaling functions for the semi-trailer, enabling safe driving at night or in low visibility conditions.

9. Safety Guards

These include side guards, rear guards, mudguards, etc., primarily used to improve tri axle flat deck trailer for sale safety and protect other vehicles and pedestrians. Different countries may have different requirements regarding the size and installation location of safety guards.

3. Common uses of flat deck trailer

Tri axle flat deck trailer for sale is primarily used for container and general heavy cargo transportation, with a wide range of applications, especially suitable for ports, logistics parks, freight companies, and long-distance transportation scenarios.

Transporting 20 foot and 40 foot Containers:

The primary use of tri axle flat deck trailer for sale is transporting standard containers. Depending on the vehicle's configuration, they can transport 20ft, 40ft, or even 45ft containers, suitable for container transshipment between ports, warehouses, logistics centers, and factories.

Port Container Transportation:

Short distance or medium-to-long-distance transportation between ports, docks, and container yards is a very common application scenario for tri axle flat deck trailer for sale. The three axle structure provides good load bearing capacity and stability, suitable for frequent loading and unloading and transporting heavy containers.

General Cargo Transportation:

In addition to containers, tri axle flat deck trailer for sale can also transport large or heavy cargo such as steel, steel pipes, timber, machinery, building materials, and bagged goods. The open flatbed structure facilitates loading and unloading.

Heavy Equipment Transportation:

Tri axle flat deck trailer for sale can also be used to transport construction machinery, generator sets, industrial equipment, and other goods. For large equipment that is inconvenient to load into containers, it can be loaded directly onto a flatbed platform and secured using straps, chains, or other methods.

Logistics and Long-Distance Freight:

For logistics companies, the tri axle flat deck trailer for sale can be used as a general-purpose transport vehicle. Tri axle flat deck trailer for sale can transport containers and other large goods as needed, resulting in high vehicle utilization.

Export Cargo Transportation:

In markets such as Africa, Southeast Asia, the Middle East, and Latin America, the tri axle flat deck trailer for sale is frequently used for port container transshipment and cross-regional cargo transportation, particularly suitable for transport conditions requiring high load-bearing capacity and strong road adaptability.

4. How long is a flat deck trailer?

The length of a tri axle flat deck trailer for sale is primarily determined by the container size and customer transportation needs. Common specifications are as follows:

Among them, a tri axle flat deck trailer for sale of approximately 12.5 meters is very common, and can usually be compatible with 20FT and 40FT containers through a reasonable chassis structure and locking configuration.

For export markets, the specific length needs to be determined based on container specifications, wheelbase, gooseneck/rear overhang, container lock location, and local road regulations. Generally, 12.5 meters, 13 meters, and 13.5 meters are common customized options.

5. How to load a tri axle flat deck trailer?

The size of the tri axle flat deck trailer loading area is determined according to the standard container size. A twist lock device for fixing the container is provided at positions corresponding to the four corners of the bottom of the container. 

Before the tri axle trailer are loaded into the container, the used turn lock head should be completely overlapped with the lock seat and fixed. Then the container is correctly placed on the tri axle trailer for sale, and then the turn lock handle is turned lock the container vertically with the lock head and the lock seat. Before unloading the container, the turn lock should be turned to the position where the lock head overlaps with the lock seat and fixed, and the container can be removed only after it is confirmed that the container is not locked.

The loading of a tri axle flat deck trailer for sale is primarily determined by the container specifications, cargo weight, and vehicle locking configuration. Before loading, the tri axle flat deck trailer for sale must be parked on a flat, firm surface, and the connection between the tractor and semi trailer must be confirmed to be reliable. The braking system, tires, suspension system, and container locking devices must also be checked for proper functioning. For 20FT, 40FT, and 45FT containers, positioning is required according to the different locking devices on the tri axle flat deck trailer for sale. During loading, port cranes, reach stackers, gantry cranes, or other specialized loading and unloading equipment are typically used to smoothly lift and move the container onto the tri axle flat deck trailer for sale, then slowly place it into the designated position on the chassis, ensuring the corner fittings at the bottom of the container accurately engage with the corresponding locking devices. After the container is fully seated, the fit between the four corner fittings and the locking devices must be checked to ensure all locking devices are correctly tightened, preventing the container from shifting forward, backward, or sideways during transport.

For 20FT containers, the middle locking device or the corresponding 20FT locking device on the tri axle flat deck trailer for sale is typically used for securing them; for 40FT containers, the corresponding 40FT locking devices at both ends of the chassis are used. Some tri axle flat deck trailer for sale feature a multi-functional locking design, compatible with 20FT, 40FT, and even 45FT containers. The number and location of locks may vary between different models; therefore, during loading, the locking positions must be operated according to the vehicle's design, and the container size alone cannot determine the fixing position. Especially when transporting heavier containers, ensure the container weight is within the semi-trailer's permissible load range, and rationally distribute weight based on the axle load requirements of the tractor and semi trailer to avoid concentrating cargo weight in one area.

If the tri axle flat deck trailer for sale is used to transport general cargo, such as steel, steel pipes, timber, construction machinery, building materials, and large equipment, the loading method differs from that of containers. Cargo is typically placed directly on the flatbed frame. During loading, the position needs to be rationally arranged according to the cargo's size and weight, maintaining as much balance as possible on both sides of the vehicle, while avoiding excessive weight concentration at the front or rear of the frame. After placement, the cargo needs to be secured using appropriate fastening devices such as straps, chains, and wire ropes. If necessary, measures such as blocks and anti-slip mats can be used to improve stability. For large machinery or other heavy cargo, the loading position should be determined based on the cargo's center of gravity and the vehicle's axle load to ensure that the cargo does not shift during transport due to sudden braking, turning, or traversing bumpy roads.

After loading, a comprehensive safety inspection is required. For container transport, the focus should be on checking the container corner fittings, locks, and frame connections, ensuring all locks are correctly locked. For general cargo, the inspection should cover the lashing devices for security, any loose cargo, and the overall balance of the tri axle flat deck trailer's load. It should also be confirmed that the cargo does not exceed the tri axle flat deck trailer's permissible length, width, and height, and that the vehicle's total weight and axle load are controlled according to local road transport regulations. Transport can only begin after confirming that the container or general cargo is reliably secured and all vehicle systems are functioning correctly.

In general, the core principles of loading a tri axle flat deck trailer for sale are "correct positioning, reasonable weight distribution, and reliable securing." When transporting containers, securing them primarily relies on container locks; when transporting general cargo, appropriate lashing methods must be used based on the cargo's weight, dimensions, and center of gravity. Proper loading methods not only improve transportation safety but also reduce damage to vehicles and goods during long distance transport, making tri axle flat deck trailer for sale more suitable for various application scenarios such as port transportation, logistics transportation, and heavy cargo transportation.

Tri Axle Flat Deck Trailer FAQ

1. What size containers can a tri axle flat deck trailer transport?

Depending on the specific model and locking design, tri axle flat deck trailer for sale can typically transport 20FT and 40FT containers. Some models with multi-functional locking designs can also transport 45FT containers. The specific container sizes that can be transported depend on the semi-trailer's length, locking layout, and customer requirements.

2. What is the load capacity of a tri axle flat deck trailer?

The load capacity of a tri axle flat deck trailer for sale depends on factors such as the frame structure, steel specifications, axles, suspension system, tires, and local road regulations. Common models can be designed with load capacities of 40 tons, 50 tons, 60 tons, or even higher. When determining the load capacity, not only the semi-trailer's design load but also the tractor's power and the local road allowances for total weight and axle load must be considered.

3. How are containers secured in a tri axle flat deck trailer?

Containers are primarily secured using container locks on the frame. During loading, a crane, reach stacker, or other specialized equipment is required to place the container in the corresponding locking position, ensuring the bottom corner fittings of the container accurately engage with the locks, and then tightening the locks. Before transportation, all locks must be checked again to ensure they are correctly locked.

4. Can a tri axle flat deck trailer transport general cargo?

Yes. Althoughtri axle flat deck trailers are primarily used for container transport, their open flatbed structure is also well-suited for transporting large goods such as steel, machinery, timber, and building materials. When transporting general cargo, the load needs to be reasonably distributed according to the weight and size of the cargo, and secured using straps, chains, or wire ropes.

5. Can tri axle flat deck trailer be customized?

Yes. Tri axle flat deck trailer can usually be customized according to the customer's transportation needs, such as vehicle length, load capacity, container locking positions, axle brand, suspension type, tire specifications, outrigger brand, and braking system. Road conditions and regulations vary from country to country, so export vehicles usually need to be configured according to the local market.

6. What is the price of a tri axle flat deck trailer?

There is no fixed price; tri axle flat deck trailer price mainly depends on the number of axles, load capacity, frame material, dimensions, suspension system, axle brand, tire brand, container lock configuration, and other optional features. Using well-known brand axles, air suspension, or higher strength frame materials will typically increase the price. Therefore, an accurate quote needs to be confirmed based on the specific configuration.

7. Does a tri axle flat deck trailer require a tractor?

Yes. A tri axle flat deck trailer is a semi trailer and does not have an independent power system; it needs to be connected to a tractor for transportation. The tractor's engine power, saddle height, traction capacity, and braking system must be matched to the semi-trailer's weight and transportation conditions.