Four axle lowbed semi trailer with an extendable gooseneck and rear ramps

EXTENDABLE GOOSENECK LOWBED

Product views show the complete four-axle lowbed and the extendable section at the front gooseneck. The main loading deck remains fixed.

EXTENDABLE GOOSENECK · FOUR AXLES

4 Axle Lowbed Semi Trailer with Extendable Gooseneck

This model keeps the fixed main deck, four-axle rear group and rear loading ramps of a standard four-axle lowbed. The difference is at the front: the gooseneck can be extended, and the required extension length is made to the customer's order.

ONE CLEAR DIFFERENCE Only the gooseneck length is adjustable.

The loading platform does not extend. Confirm the required neck length and tractor details before the trailer is built.

4 Axles Rear axle group

Fixed Deck Standard lowbed platform

Extendable Neck Length made to order

Rear Ramps Rear loading access

CUSTOM GOOSENECK LENGTH

Can the Gooseneck Extension Length Be Customized?

Yes. The extension length can be built to the customer's required dimensions. Unless the order states otherwise, the main deck, four-axle layout and rear loading arrangement stay the same as the standard lowbed configuration.

Required Neck Length State the required extension or the final gooseneck length.

Tractor Details Provide the tractor model and fifth-wheel height.

Fixed Loading Deck The main platform keeps the standard four-axle lowbed layout.

Final Configuration Confirm the neck length in the quotation before production.

FOR AN ACCURATE QUOTE Send the required gooseneck length, tractor model, cargo details and destination.

PRODUCT DETAILS

A Closer Look at the Extendable Gooseneck

chenluvehicle show the complete four-axle lowbed, the extendable section at the front, the numbered length positions and the connection lines between the moving sections. The main deck remains fixed.

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PRODUCT PHOTO 01

Fixed Main Deck and Four-Axle Group

This overhead view shows the loading deck above the four-axle rear group. The deck is part of the standard lowbed layout and does not extend with the gooseneck.

Fixed lowbed loading deck
Four rear axle positions
Rear section shown in transport form

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Complete four-axle lowbed trailer with extendable gooseneck and rear ramps

PRODUCT PHOTO 02

Complete Lowbed Trailer Layout

The full view shows where the extendable gooseneck sits in the trailer. Behind it are the fixed main deck, four-axle group and rear loading ramps.

Extendable gooseneck at the front
Fixed main platform through the centre
Rear ramps for loading access

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Numbered extension positions on the four-axle lowbed gooseneck

PRODUCT PHOTO 03

Gooseneck Length Positions

The numbered marks identify the gooseneck position during length adjustment. The required extension range is set to the customer's order before production.

Numbered position marks
Extension direction shown at the front
Gooseneck length made to order

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Coiled connection lines at the extendable gooseneck joint

PRODUCT PHOTO 04

Connection Lines at the Extension Joint

This close-up shows the coiled lines routed between the adjustable sections. Their routing keeps the connections together as the gooseneck position changes.

Coiled connection lines
Protected routing inside the joint area
Connections checked at the selected length

Configuration Note The photos confirm a four-axle lowbed with a fixed deck, rear ramps and an extendable gooseneck. The required gooseneck extension length is customized for each order.

PRODUCTION PROCESS

How the Extendable Gooseneck Lowbed Is Built

The four-axle lowbed follows the same main production sequence as the standard model. The extra work is at the front, where the extendable gooseneck is assembled to the length required for the order.

Four-axle extendable gooseneck lowbed trailer production process — Use one original factory photo showing this trailer during frame assembly, extendable gooseneck fitting or final assembly.

Confirm the Build

Set the trailer dimensions, four-axle layout, rear-ramp form and required gooseneck extension length.

Prepare the Frame Parts

Cut and prepare the sections for the fixed main deck, rear frame and extendable gooseneck.

Assemble the Main Frame

Position and weld the main frame, then check the deck alignment before the running gear is installed.

Fit the Extendable Gooseneck

Assemble the sliding section and connection area to match the gooseneck length specified for the order.

Install the Axles and Rear Ramps

Fit the four-axle group, rear loading ramps and the connection lines that pass through the gooseneck joint.

Finish and Check the Trailer

Complete the surface finish and final assembly, then check the gooseneck movement and trailer connections.

Main deck stays fixed. The customized part of this model is the extendable gooseneck and its required extension length.

REFERENCE SPECIFICATIONS

4 Axle Extendable Gooseneck Lowbed Specifications

These dimensions come from the supplied four-axle lowbed scheme. The main deck is fixed. Only the gooseneck extension length is customized to the customer's order.

15,500 mm Overall length

11,901 mm Main deck length

3,000 mm Overall width

4 Axles Rear axle group

PARAMETER	REFERENCE VALUE
TRAILER LAYOUT
Product type	4 axle lowbed semi trailer with extendable gooseneck
Overall length	15,500 mm
Overall width	3,000 mm
Main deck length	11,901 mm
Main deck	Fixed
Deck height	1,250 mm
GOOSENECK
Gooseneck length	3,300 mm
Fifth-wheel height	1,350 mm
Gooseneck extension length	Customized to customer requirements
AXLES AND REAR SECTION
Axle count	4 axles
Axle spacing	1,310 + 1,310 + 1,310 mm
Rear overhang	1,487 mm
Rear loading ramps	Two upright ramps shown
Overall height with ramps raised	3,940 mm

Drawing reference All dimensions are in millimetres. Payload, axle ratings, tires, suspension, braking system and material grades are not stated in this scheme and should be listed separately in the final quotation.

FINISHED TRAILER VIDEO

See the Finished 4 Axle Extendable Gooseneck Lowbed

This factory walkaround shows the completed four-axle lowbed from several angles. It covers the fixed main deck, extendable gooseneck, four-axle rear group, loading ramps and finished connection details.

Use the video to review the visible layout and finish of this build. The main platform is fixed; the adjustable section is at the front gooseneck.

Factory walkaround of the finished 4 axle lowbed semi trailer with extendable gooseneck.

Complete Trailer View

See the finished trailer profile and the position of each main section from front to rear.

Extendable Gooseneck

Review the front gooseneck, extension joint and the visible length position details.

Fixed Main Deck

View the loading platform, deck surface and side structure of the standard lowbed section.

Four Axles and Rear Ramps

Check the four-axle rear group and the upright ramps fitted at the back of the trailer.

Finished Connections

Look at the connection lines, fitted equipment and exterior finish on the completed build.

Video Note This video is a finished-trailer display, not a loading or gooseneck adjustment guide. Dimensions and equipment may change with the order.

TRAILER COMPONENTS

Optional Parts And Accessories

Semi-Trailer Axle Support Plate

American-Style Axle

Trailer Suspension Parts

Trailer Suspension Support Leg

WABCO Brake Valve

FUHUA (TUWA) Trailer Axle

German-style semi-trailer suspension assembly

German-Style Trailer Suspension

BPW Trailer Axle

Why Trust Chenlu?

Factory-direct semi-trailer manufacturing

Factory-Direct Manufacturing

CHENLU presents its own semi-trailer manufacturing base with modern workshops, CNC cutting, automatic welding lines and painting facilities. This supports direct communication between the buyer, engineering team and production team.

OEM and ODM trailer configuration review

OEM/ODM Configuration Review

The published customization scope includes axle number and load configuration, suspension type, ride height, frame reinforcement, deck requirements, branding, colour and logo. The final scope should be confirmed against the cargo, tractor and destination route.

Process-Based Quality Control

The factory workflow covers material preparation, main-beam welding, frame assembly, surface treatment, painting, final assembly, inspection and testing. Quality checks should be recorded against the actual project configuration before delivery.

B2B Export and Project Support

CHENLU works with fleet owners, contractors, distributors and project buyers across logistics, construction, mining and heavy-equipment transport applications. The quotation should confirm the tractor interface, route, axle-load requirements and local permits.

CUSTOMER VISITS

Meet Chenlu and Review the Manufacturing Process

Customer visits support direct communication between buyers, engineering teams and the manufacturing department before the final configuration is confirmed.

Customer visit at the Chenlu manufacturing facility

Brazilian business partner visiting Chenlu

Business partner reviewing trailer production

DELIVERY AND CUSTOMER FEEDBACK

Follow the Project from Delivery to Customer Feedback

Use approved delivery photos, project records and customer comments to present the completed communication and delivery process.

APPROVED CUSTOMER FEEDBACK

Publish the Original Customer Message with Permission

Add an approved customer comment, delivery record or project feedback here after the customer confirms the wording and image usage.

Delivery Record

Approved delivery photo or project record.

Customer Comment

Original customer message with permission.

Project Follow-Up

Approved feedback about communication and support.

FREQUENTLY ASKED QUESTIONS

4-Axle Extendable Lowbed — Common Buyer Questions

Review the main questions about extension length, cargo support, rear loading, gooseneck configuration and working-length ratings before sending your cargo information for technical review.

Is longitudinal extension the same as a widening deck?

No. Longitudinal extension increases the available trailer length, while side extensions increase width. If the cargo needs both extra length and extra width, the two requirements should be identified separately in the cargo drawing and quotation request.

Does the gooseneck detach because the trailer is extendable?

No. Platform extension and gooseneck removal are separate trailer functions. The neck type should be confirmed independently. This extendable configuration should not automatically be treated as a detachable-gooseneck or front-loading trailer.

How should I choose the working length for a long load?

Start with the cargo's approved support locations and transport dimensions. The selected trailer position should accommodate the actual wheels, tracks, skids or mounting feet and must have a suitable load rating for that working length. Maximum extension is not automatically the correct position for every cargo.

Does the maximum extension have the same load rating as the closed deck?

Do not assume that it does. Request a load schedule for the actual working length and cargo arrangement. The approved rating should consider the cargo support pattern together with kingpin and axle-group reactions at that trailer position.

Is the extension opening suitable for wheels or tracks?

Not automatically. The loading path and cargo contact points must remain on approved support areas. If wheels, tracks or support feet need to cross the extension opening, confirm whether rated bridging or another engineered support arrangement is required.

Can the trailer be extended or retracted while loaded?

Do not assume that loaded length adjustment is permitted. Obtain the manufacturer's procedure for the exact trailer configuration and follow its load-state restrictions. The permitted trailer position during loading and transport should be defined before operation.

Can wheeled or tracked equipment load through the rear ramp?

The complete machine path must be reviewed from the ground to the final transport position. Check the ramp, rear transition, extension opening, machine width, wheel or track spacing and ground clearance. A rear ramp alone does not confirm that the machine can reach its intended position.

Does a four-axle extendable lowbed require steering axles?

That depends on the final layout and route review. Working length, axle positions, turning space, site access and route geometry all matter. Steering equipment is not confirmed simply because the trailer has four axles or an extendable platform.

What information is needed for an extension review?

Send the cargo dimensions, transport mass, required support span, wheel, track or support-foot positions, loading method and destination. A marked cargo drawing and center-of-gravity information are especially useful for reviewing the required working length.

What is needed for a price quotation?

Provide the cargo dimensions and mass, required support span, loading method, destination, quantity and contact information. When available, also include the tractor model, route restrictions, desired closed and extended lengths, target delivery date and preferred trade term.