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What is an Extendable or Expandable Flatbed Semi Trailer?

Table of Contents

Chapter 1. What is an extendable trailer?

Chapter 2.What are the common types of the telescopic trailer?

Chapter 3. How to extend and close an extendable flatbed trailer?

Chapter 4. How to design the brake air circuit and circuit of the heavy haul trailer?

Chapter 5. Does the rear wheel of the extendable lowbed trailer need a steering wheel design?

Chapter 6. Key components of an telescopic trailer

              6.1 Gooseneck function

              6.2 Trailer frame

              6.3 Hydraulic system

              6.4 Braking system

              6.5 Electrical system

              6.6 System Power

Chapter 7: Longitudinal extendable trailer and wide extendable trailer


Extendable Trailer | Telescopic Trailer for Sale-TITAN Vehicle

48'-80' extendable flatbed trailer for sale


Chapter 1. What is an extendable trailer?

Extendable trailer can used for transport both wind blades and the tower. This is the kind of telescopic trailer that you need, if you want to handle the different kinds of loads in your operations.

Extendable lowbed trailer also have more name, such as telescopic semi-trailers, extendable trailers for blade, telescopic blade trailer, extendable boom trailer.

Extendable trailer, you can freely adjust the length of the extendable trailer according to the length of the cargo, so as to meet the transportation needs of different goods

With the rapid development of the global transportation industry, semi-trailers have also begun to diversify into a variety of categories. Ordinary semi-trailers have limited capabilities, but special trailers also have single functions and low utilization rates.

Therefore, the bosses of transportation companies increasingly need a telescopic ordinary extendable trailer that can load very long cargoes, such as long cement pipes, steel pipes, wood, wind blades for power generation, etc.


Chapter 2.What are the common types of telescopic trailer?

Here are some photos of our extendable flatbed trailer:

Extendable Trailer | Telescopic Trailer for Sale-TITAN Vehicle

Telescopic specialized rgn extendable trailers for sale extendable flatbed trailer


Common extendable flatbed trailer methods:

In the middle, In the back of the gooseneck, in the tail, in the front.

We can freely change the design of drawing length according to the requirements of customers.


Chapter 3. How to extend and close an extendable flatbed trailer?

Extendable flatbed traile, the pulling and closing operation of a extendable flated trailer is very simple. You only need to use the tractor to move forward or reverse when the rear axle is braked. After reaching the working distance, lock it with the positioning pin.


Chapter 4. How to design the brake air circuit and circuit of the heavy haul trailer?

Air pipe and electric wire for the circuit adopts the dragging pulley method, which expands and contracts as the inner beam expands and contracts. After reaching the working position, it can be fixed.


Chapter 5. Does the rear wheel of the extendable lowbed trailers need a steering axles design?

Whether the rear wheels use steering wheels is determined based on the total length after drawing and the required road conditions.

Extendable Trailer | Telescopic Trailer for Sale-TITAN Vehicle

Telescopic trailer steering axles

(1) Advantages of steering wheels and ordinary axles

The steering wheel structure can meet some special turning needs. The hydraulic control of the hydraulic station is used to realize the steering of the rear wheels.

(2) Disadvantages of steering wheels and ordinary axles

The cost of steering the axle is twice the cost of an ordinary axle, requiring more capital.

Steering axle load capacity is much smaller than ordinary axles. Large tonnage loads need to be changed to axis mode.

extendable trailer

Extendable Trailer/ Telescopic Trailer

Chapter 6. Key components of a telescopic trailer

The telescopic trailer is a sturdy transport platform with gooseneck, frame, axle components, various hydraulic systems,

Braking system, steering system, power unit, electrical equipment, etc. The following is a detailed description of how these parts adapt to function:

6.1 Gooseneck function of the telescopic trailer

The gooseneck function of the trailer is a hydraulic component, which can usually be adjusted by the telescopic expansion of the hydraulic cylinder.

The steering mechanism that pulls the retractable trailer is usually installed in the gooseneck.

The assembly and connection of the gooseneck are usually carried out through the turntable, wedges and tow pins and the tractor saddle.

As the tractor rotates, the steering cylinder is pushed and transmitted to the steering axle of the trailer through the hydraulic circuit.

extendable trailer

6. 2 Trailer frame of the telescopic trailer

The extendable trailer frame structure has main beams, left and right half plates, and transverse devices.

This is the main structure of the trailer and bears the transported load. The frame adopts high-strength steel structure grade HG785/B700L/Q690, and the yield strength is at least 660MPa.

The half plates on the left and right are linked to the main beams by transverse devices.

These half plates can be pushed into the cylinder to adjust the width of the vehicle and form a wheelbase extension. The hydraulic gooseneck is installed at the head of the frame, and a hydraulic ladder is installed at the rear.

6.3 Hydraulic system of the telescopic trailer

The trailer has a hydraulic system that includes control circuits such as suspension lifting, gooseneck lifting, synchronous steering, lateral adjustment and lifting ladders.

The basic components of a hydraulic system are hydraulic valve blocks, joints and pipes. The entire system is equipped with a hydraulic source through the power unit. A safety valve is also installed in the loop.

6.4 Braking system of the telescopic trailer

To further enhance the rapid operation of the retractable trailer, a braking system is provided. This includes service brakes, two-line car braking systems and parking brakes.

The power line and control line are set separately. The most important components include the connector to the tractor,

Various specifications of emergency relay valve, gas storage tank, dual brake chambers and components connected with pipelines.

extendable trailer

6.5 Electrical system of the telescopic trailer

The 24V single wire system constitutes the electrical system of the retractable trailer. In general, the electrical system includes lights, connectors and wires, and other components.

The electrical connection of the selected tractor is the national standard 24N electrical connector.

The external signal and lighting components are usually equipped with brake lights, rear position lights and position lights, and positions useful in this application.

6.6 System Power of the telescopic trailer

The power unit consists of a small diesel engine, which is the main driving force. Other components include hydraulic oil tanks, control lines and pipes, and hydraulic pumps. This unit provides hydraulic source for the hydraulic system of the trailer.

extendable trailer

60 meters behind the gooseneck of the three-axis single-girder blade transporter

extendable trailer


The extended type of trailer allows the width of the extendable trailer to be increased so that it can bear a much wider load than most traditional loads.

Basically, this is a variable-size structure intended to be used as an extendable trailer mechanism to provide space in the width direction for loads that require such adjustments.

Ideally, the trailer structure includes a floor having at least two parts and a side wall having two parts respectively.

The part can be moved by manually turning the crank or using an electric motor by the provided power unit.

In this setting, there is a horizontal expansion that causes expansion in the width direction, thereby providing room for the maximum width load.

When it is necessary to bear a small load in the lateral direction, it can be contracted to provide ground space that can accommodate a given load.

The maneuverability characteristics are comparable to those of a ramp lifting device that can be adjusted to perfectly lift a given load from the ground.

Once loaded onto the extendable trailer, it can be towed to the desired location with a tractor.

These extendable trailers take different forms. A trailer mechanism is provided for coupling to a pivotable trailer ramp to provide assistance during manual lowering and raising of the ramp.

In order to adapt to different load bases, lateral positioning of slopes can be made possible.

With this possibility, you can make the most appropriate adjustments to ensure that your cargo is safely placed on the trailer without worrying about falling during transportation.

Generally, the extendable trailer allows users to choose many options to enhance the safety of their operations compared to when a fixed frame is used entirely

extendable trailer

Due to the ever-changing requirements of cargo in terms of size, especially in length and width, the need to build durable solutions has led to the manufacture of scalable trailers.

Rather than buying a full-power vehicle to carry different loads of different lengths, an extendable trailer towed by a tractor can help reduce the cost of buying many vehicles to adapt to different situations.

With an extendable trailer, you can now adjust the platform to accommodate different lengths of cargo and use the tractor to transport them comfortably.

The trailer can be extended in the longitudinal or width direction to achieve two different or almost the same aspects of expansion (vertical) and expansion (horizontal).

According to your needs and the type of goods to be transported, you can choose either of the two types to meet different lengths or widths of the goods.

This goes a long way to ensure an effective transportation solution without having to buy different trailers for different cargo sizes, which can be an expensive affair.

extendable trailer


Chapter 7: Longitudinal extendable trailer and wide extendable trailer


7.1 Longitudinal extendable trailer

Longitudinal extendability is usually used to transport very long cargo, such as the bridge between fuel tanks, windmill blades and other similar cargo.

In order to withstand these loads, the trailer has to extend its length. When it does not bear any load, it needs to be adjusted back to a shorter length. However, its application and use should be based on local regulations and driving safety.

7.2 Wide extendable trailer

Wide extendable trailers are usually used to withstand larger lateral loads. Trailers are usually extended horizontally to make room for such loads.

When it is not under any load, it needs to be adjusted back to a shorter width according to local laws and regulations on driving safety.

In order to meet the needs of large-scale transportation and large-scale cargo transportation on the road, the frame width of the trailer was adjusted to undertake this work.

two. Basic configuration of longitudinally extendable trailer

The conventional retractable trailer configuration has a fixed frame and an additional frame that can be connected to the fixed frame.

The second frame is in sliding contact with the fixed frame to provide the required longitudinal extension.

This means that in order to lengthen or shorten the trailer's equipment, the free frame can be moved relative to the fixed frame.

The movable frame is usually located at the rear of the towed trailer. This freely movable trailer consists of a set of wheels and axles firmly fixed on it.



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