Low loader trailer: Type Application Spec Dimension Parts

The low loader trailer is a special vehicle for transporting construction machinery. Let’s take a closer look today:

What is a low loader trailer

Low loader trailers usually adopt an open beam (or sound type) frame. The front section of the whole structure likes swan-neck (swan-neck front section of the traction pin is connected with the traction saddle on the traction car, the swan-neck rear end is associated with the semi-trailer frame), the middle section is the cargo platform (the lowest part of the frame), and the back end is the wheel frame (including wheels).

3 axle 50 ton lowbed trailer
3 axle 50 ton low boy trailer for sale

When we load some machinery onto a semi low loader trailer, we usually start packing from the rear end of the drop bed low loader trailer, which is equivalent to moving the machinery from the flat surface of the rear wheel frame. Another option is removing the wheels, setting them aside, and loading and attaching the machinery to the low loader trailer.

Application of low loader trailer

The low loader trailer truck is usually used to transport heavy vehicles (such as tractors, buses, special purpose vehicles, etc.), rail vehicles, mining machinery, forestry machinery, construction machinery (such as excavators, bulldozers, loaders, asphalt pavers, cranes, etc.) and other heavy cargo. The lower its center of gravity, the better its stability, safety, and ability to transport super-high loads and cross rugged terrain.

The main types of low loader transport trailers are two axles, four-axle, three axles, three lines six axles, high low high. (Depending on the axle number and tire size, the carrying capacity of the low loader trailer is also different. The more axles there are, the more cargo it can carry.

Different types of low loader trailer

Get a better idea of the low loader trailer with the video and pictures below.

4 axle 70 ton lowbed trailer
four axles 70-ton low boy trailer with hydraulic ramps for sale
3 axle 50 ton step lowbed trailer
3 axles 50-ton step low boy trailer for sale

Low loader trailer specifications

Size: 16000 * 1500 * 3500 mm (customized)

Weight: About 9-13 t

Load capacity (T): 60T-100T

Axle: 13T /16T, FUWA /BPW /Huajing brand

Tires: 8.25 R20/10.00 R20/11.00 R20/12.00 R20

Suspension: mechanical suspension (German or American) or air suspension (Chinese brand or BPW brand for overseas market)
Landing gear: JOST brand D200T or Chinese brand 28Tons (two-speed)

Main beam: Height: 450mm-520mm Upper plate: 14mm-25mm Middle

Plate: 8mm-12mm Lower plate: 16mm-25mm

Material: Q345B steel

Axle: FUWA brand, 13Tons or 16Tons

Side beam: 16mm channel steel (material: Q235 steel)

Brake air chamber: WABCO RE 6 relay valve; T30/30 + T30 spring brake chamber (TKL brand); 45L air tank (special for overseas market)

ABS: Optional

Socket: 7 needle socket (7 wires)

Toolbox: 1m x 0.5m x 0.5m (The toolbox contains one tire wrench, one piston sleeve, and one crank. It can be customized to suit your needs.)

Surface coating: sandblasting, anti-rust chassis surface, and anti-corrosion primer, two layers can only be painted one layer.

Low bed trailer loading capacity: 20-120 ton

–  2 axles low bed semi trailer capacity: 20-40 ton

–  3 axles low loader trailer capacity: 40-70 ton

–  4 axles low bed truck trailer loading capacity: 70-90 ton

All low bed truck capacities can be customized.

Lowbed trailer dimensions

–  2 axles low loader trailer truck dimensions: 13000x3000x1750/1250 mm

–  3 axle low loader trailer measurements: 13500x3000x1700/1250 mm

–  4 axle heavy duty low loader trailer standard size: 14000x3000x1750/1250 mm

Low loader trailer for sale

Panda low loader trailer packaging and shipping

Panda low boy trailer will be treated to prevent moisture before transportation. We will first spray a layer of wax on the low bed trailer and then will cover a tarp to ensure that it will not be corroded by seawater when it is transported.

detachable lowbed trailer for sale transport
detachable low bed trailer for sale transport

Loading test of semi equipment trailers

All of our panda gooseneck low loader trailers must be load tested to ensure that each vehicle can meet the standard before you can. In the process of your use, we will have a specialized person to guide you in the use and answer questions.

low boy trailer test
low loader trailer for sale test

The low loader trailer factory image

lwobed trailer factory
low loader trailers factory

Production process

Before we produce, first of all, the Panda technical department will provide you with suitable drawings according to your needs. After the drawings are confirmed to be correct, we will start to put them into production.

1. Cutting of steel sheet material

We will first cut the steel according to the design of each part of the drawing, out of each part of another addition, such as beam web, reinforcement plate, standard small accessories, etc.

2. Submerged arc welding crossbeam, crossbeam fixed

Then, we need to fix the cut web and upper and lower wing plates to the welding point in the next step, and then use submerged arc welding to weld the cross beam.

low boy trailer production process
low loader trailer production process

3. Aligning beam, aligning beam

First, cut out the beam web, cut into a U-shaped hole that the beam can pass through, and then fix the welded I-beam parallel to the beam. This time, must determine this calibration beam, this is very important for semi low loader. If the parallel error of the two I-beams is large, the wear and tear on the tires are very powerful.

4. Connect the side beams and weld the main pin

After the main beam is formed, only the side beams are welded to form the frame structure, the traction pin traction plate needs to be welded to the position required by the drawing, the welding process is demanding, otherwise, it will be easy to have a low loader trailer chassis tilt.

5. Welding frame and suspension

Welding suspension must strictly control the size and maintain verticality, otherwise, it will cause tire wear.

low boy trailer production process
low loader trailer production process

6. connecting gooseneck

We weld the gooseneck of the low loader trailer and then weld to strengthen the plate.

7. Lay the base plate

We welded the base plate to the overall frame.

8. Start sanding and painting

We need to sand first before painting, and then we need to paint. Painting is a very important thing. Aesthetics and paint treatment is very important to technicians.

low boy trailer production process
low loader trailer production process

How does the low loader trailer works?

Low loader trailer is widely used, generally for medium and long distance freight. Its frame is a through-beam structure, and the longitudinal beam adopts straight live gooseneck type.

The height of the web varies from 400mm to 550mm, the longitudinal beam is welded by automatic submerged arc welding, the frame is shot blasted, and the crossbeam is welded through the longitudinal beam as a whole.

The overall material used for low loader trailer is high strength steel, the overall body quality is more reliable, at the same time, low loader trailers equipped with a variety of parts, making low loader trailers better adaptability and longer service life.

low boy trailer loading
low loader semi trailer loading test

The semi trailer low loader usually transports vehicles, including tractors, buses, special vehicles, rail vehicles, mining machinery, forestry machinery, agricultural machinery, such as excavators, bulldozers, loaders, pavers, cranes, and other heavy-duty goods, low boy trailers, the lower the overall center of gravity, its safety and stability can also be better, while the ability to transport some elevated obstacles and super high cargo can also be stronger.

Generally, the low back trailer for loading is through the back part of the loading equipment and then through the mechanical equipment, the equipment is fixed on the low boy trailer.


1. Welding method for linkage drawbar. The old linkage drawbar had only a circle in the middle to pass through the traction pin. The linkage drawbar is now designed with several holes in the middle and around, playing an essential role in drainage and effectively preventing corrosion.

2. The girder at the front swan neck sometimes breaks, so we have reinforcement plates.

3. Suspension is the main component and important bearing part of the low loader truck, so the welding joint must be handled appropriately when welding. We added a base plate under the vehicle suspension.

Low loader parts

1. Main beam

The main beam is a 500mm thickened main beam (Q460C high strength steel)
PANDA new low bed loader trailer adopts a 500mm main beam, the general gooseneck lowloader semi trailer and trailer uses a 450mm main beam, its load capacity can effectively increase by about 10%, which can meet many bad roads.
300mm wide main beam

PANDA low platform trailer adopts a 300mm wide main beam, while the general low bed vehicle uses 140mm, 300 mm can increase the bearing capacity by 20% compared with 140mm, and it can run smoothly.

low bed trailer main bead
low loader trailer for sale main bead

2. Side beam

The side beam adopts a 300mm high “I” type steel side beam.
The side beam of the PANDA lowboy truck trailer adopts a 300mm “I-beam” design, while the common low loader trailer adopts a 250mm side beam, which has more than 1 times the load capacity of the common low loader truck trailer.

10mm thick side beam

PANDA low boy truck produces by 10mm thick side beam, the common low bed trailer adopts 4.5mm, its loading capacity exceeds the common semi truck with low loader trailer by 30%.

3. Powerful ramp

PANDA low boy trailer loading ramp is made of T700 high strength steel with large load capacity. We will not have deformation when loading equipment into drop deck low loader trailer.

The low loader trailer can load various goods suitable for various mechanical equipment, large objects, road construction equipment, large tank, power plant equipment, and all kinds of steel transport.

low bed trailer for sale main bead
gooseneck low loader trailer main bead

The lowbed

1. The low loader trailer series has many construction types, such as flat plate, open beam, and exposed tire. The longitudinal beam is straight or swan-neck. Its frame is ladder type, and the longitudinal beam section’ shape is like “工,” so it has the characteristics of high rigidity and high strength.

2. For the frame, its cargo platform plane is relatively low. This design ensures the smooth transportation of goods. So it can carry all kinds of construction machinery, large equipment, and steel.

3. It uses a three-axis balance type, two-axis balance type, or rigid suspension form in the front and rear leaf spring between the mass balance block, which can make the deflection of the front and rear leaf spring produce the same amount of change and can make the show and back axle force balance.

4. The low loader trailer series products are suitable for transporting various mechanical equipment, large objects, highway construction equipment, large tanks, power station equipment, and all kinds of steel transportation.

It is versatile, efficient, and fast to transport. The vehicle uses advanced computer-aided design software to design various advanced technology. At the same time, we can create the bearing surface of the frame according to the user’s requirements to meet the transportation requirements for various goods.

Vehicle maintenance

Brake pad maintenance

The customer needs to manage and maintain the brake control system of the low loader trailer. Clean and high-quality brake fluid is essential to the safety performance of the brake operating system. The brake oil of the vehicle should not be reused, and the brake fluid that does not meet the standard should be discarded in time. The price of vehicle maintenance is meager, and safety is one of our biggest concerns.

About the replacement of the gooseneck low loader trailer’s brake pad

We usually decide whether the brake shoes should be replaced by looking at the brake warning light on the dashboard, but this is unsafe. The warning lights don’t light up in some cars until the brake shoes are entirely worn. If the metal base of the brake pad and the brake disc is worn away,  you’ll see shiny cut iron near the edges of the tire and rim.

Therefore, whenever the vehicle comes into the factory for maintenance, the user needs to check whether the brake pads can be used. The brake pads that are badly worn should be replaced in advance.

About the tire inspection

The user needs to ensure the tire pressure on the low loader truck trailer is appropriate. In winter, the temperature is low. According to the principle of thermal expansion and cold contraction, the driver should moderately increase the inflation pressure of the tire to reduce tire wear.

However, too much air pressure can loosen the tires’ grip when driving on icy roads. Generally, it would be best to use 10 to 15 percent more inflation pressure in severe winter conditions than the standard. In winter, The driver must frequently check the semi’s tires’ air pressure. When the tire pressure is not enough, please provide a timely supplement.

The tire wear

The difference in traction and grip between new and old tires is enormous. The tire of the gooseneck low back trailer should be replaced in time according to the wear condition, and the tire used has the wear mark at 1.6 mm of the pattern depth.

Under regular application, tire wear to this point indicates that the tire needs to be replaced.

Clean the tires in time

Drivers should pay attention to cleaning tires before and after driving in winter. Before going, the driver needs to check whether the tire pattern of the low bed loader trailer is covered with snow and ice. If so, clean it up.

If the ice in the tire is very hard, it can not be forced to pry, nor can it be used to pour boiling water on the tire. Drivers need to pour water on the surface of the tire pattern at an average temperature. In addition, we also need to check whether there are stones, iron, nails, and other foreign bodies in the way of the tire. If there are, the driver needs to clean them in time.

Details to pay attention to when choosing tires in winter

It’s common to add chains to the tires of the low loader trailer during snow and ice. But the driver must understand that the anti-skid chain will cause damage to tires and shock absorbers. If the balanced ratio of the tire is meager, it can damage the hub and cause the tire to bulge. The service life of tires will be reduced, so drivers must pay attention.

Main points of buying the low loader truck

  • 1. Manufacturer’s technology. The production technology of each manufacturer is different. From the design of the low bed to the quality of the production equipment, and then to the production of workers’ experience are very different.
  • 2. The steel plate material. Steel plate material can be divided into ordinary steel plate, high-strength steel plate, and manganese plate. The low bed made of standard steel plate is generally lower, at least 2000 YUAN cheaper than the other two kinds of steel plate. So when you buy a semi trailer low loader, don’t just think about the price. If you want to buy a low loader truck at a meager price, it must be made of inferior steel.
  • 3. Selection of accessories

Contact Us

If you have gooseneck low base trailer needs or encounter any common low loader trailer problems, you can contact us at any time; we will reply to you as soon as we receive it.


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