Trailer Parts Buying Guide · Published: November 28, 2024 · Updated: June 3, 2026 · By Kales Vehicle Axle Engineering Team · Reviewed by Kales Export Parts Sales Engineering · Market focus: Africa, Latin America, Middle East heavy-haul fleets, lowbed trailer builders, and trailer rebuild workshops
3-line 6-axle lowbed trailer axle set: this Kales heavy-duty axle family is built for buyers who need a complete multi-axle running-gear package for lowbed trailers carrying transformers, mining equipment, project cargo, and other oversized loads. The page covers the KATR30A, KATR30B, KATR40A, and KATR40B configurations sold under one heavy-haul axle platform.
Engineering guidance from the Kales Vehicle parts team for buyers comparing a 3-line 6-axle heavy-haul axle package with standard rear axles, follower steering axles, and lowered axle alternatives.
Quick answer: choose this 3-line 6-axle lowbed trailer axle family when your trailer program needs multi-axle load sharing, stronger support for oversized cargo, and a heavy-haul package that is easier to source as one matched set. It is the right fit for lowbed and specialized trailers where standard 3-axle running gear is no longer enough.
Technical Snapshot
| Product type | 3-line 6-axle heavy-duty lowbed trailer axle set family |
|---|---|
| Family models | KATR30A, KATR30B, KATR40A, KATR40B |
| Model rating range | 30,000 to 40,000 kg depending on model |
| Primary application | Lowbed heavy-haul trailers and specialized project transport trailers |
| Track range | 865 to 965 mm |
| Wheelbase range | 1220 to 1362 mm |
| Central distance range | 1600 to 1760 mm |
| Total width range | 2965 to 3305 mm |
| Central height | 190 to 220 mm |
| Side swing | 6 degrees left and right |
| Brake options | 311 x 190 mm or 420 x 180 mm depending on model |
| Suspension material | Q345 steel plate suspension with polyurethane torsion-bar bushings |
| Custom quotation | Contact KALES for a tailored quotation based on the required configuration, order quantity, and destination. |
Family configuration table
| Model | Rated load (kg) | Track (mm) | Wheelbase (mm) | Central distance (mm) | Total width (mm) | Brake | Wheel fixing | Tyre |
|---|---|---|---|---|---|---|---|---|
| KATR30A | 30000 | 865 | 1220 | 1600 | 2980 | 311 x 190 | 6.5-15 | 8.25-15 |
| KATR30B | 30000 | 865 | 1220 | 1600 | 2965 | 420 x 180 | 6.5-20 | 8.25-20 |
| KATR40A | 30000 | 865 | 1220 | 1600 | 2980 | 311 x 190 | 6.5-16 | 8.25-15 |
| KATR40B | 40000 | 965 | 1362 | 1760 | 3305 | 311 x 190 | 7.5-20 | 10.00-20 |
Best Fit Operating Profile
This axle family is best suited to lowbed trailers carrying concentrated heavy equipment and oversized project cargo where a normal semi-trailer axle layout cannot distribute load correctly. It works well for heavy haul corridors, mining support equipment movement, transformer transport, and specialized trailer manufacturing or rebuilding programs.
Best for
- Lowbed trailers for excavators, transformers, and industrial modules
- Trailer builders that need a matched 3-line 6-axle running-gear package
- Heavy-haul fleets working on project logistics and oversized cargo permits
- Workshops rebuilding or upgrading old multi-axle lowbed trailers
Not ideal for
- Standard flatbed, sidewall, or bulk trailers that only need mainstream 13T to 20T rear axles
- Buyers looking for the simplest low-cost axle replacement rather than a full heavy-haul set
- Trailer programs that mainly need steering behavior improvement instead of higher load distribution capacity
Why Buyers Choose This Multi-Axle Heavy-Haul Set
- Multi-axle load sharing: built for trailer programs that need to spread heavy point loads across more axle positions.
- Matched family logic: KATR30A, KATR30B, KATR40A, and KATR40B are offered as one coordinated heavy-haul package instead of unrelated single-axle purchases.
- High-strength tubular axle construction: positioned for harder working conditions and oversized project transport.
- Hot-rolling and quenching process: the axle body and axle heads are engineered for better structural durability under repeated heavy-load cycles.
- Q345 suspension with polyurethane bushings: useful for controlling durability and serviceability on heavy-haul trailers.
- configuration-based structure: practical for buyers who need the correct heavy-haul configuration rather than one generic stock number.
Specification-backed advantages
- Suspension material: Q345 steel plate suspension with polyurethane torsion-bar bushings. This provides a concrete durability and load-control basis for the stated duty cycle.
- Model: Rated load (kg). This defines the working band to validate against the cargo, route, and local legal limits.
- Brake options: 311 x 190 mm or 420 x 180 mm depending on model. This gives the buyer a specific braking or safety package to verify for the intended route.
How This 3-Line 6-Axle Set Should Be Evaluated
The correct way to assess a 3-line 6-axle lowbed trailer axle set is not by price headline alone. Buyers should confirm the trailer’s target cargo weight, deck geometry, permit requirements, brake expectations, tire specification, and whether the project needs a fixed multi-axle load platform or a different specialty axle logic. In heavy-haul service, fitment mistakes are expensive.
| Buyer situation | Best-fit Kales option | Why |
|---|---|---|
| Heavy-haul lowbed trailer that needs a complete multi-axle support package | This 3-line 6-axle family | It is built around heavy load distribution and specialized lowbed running gear |
| Heavy trailer that only needs a stronger mainstream rear axle | 20T American type drum trailer axle | Better fit when the trailer does not require a full multi-axle lowbed set |
| Trailer program that needs tighter turning behavior | Follower steering trailer axle | Better fit when the main issue is tire scrub and maneuverability, not only load distribution |
| Low-deck trailer that mainly needs a lowered axle geometry | 13T American type drop axle | Better fit when deck height is the main design constraint |
Engineering and Serviceability Details
This is a heavy-haul family page, not one generic axle SKU
Contact KALES for a tailored quotation based on the required configuration, order quantity, and destination.
Material and process choices matter under repeated heavy-load cycles
The family is built around high-strength alloy tubular axles, integrated hot-rolling process improvements, and medium-frequency quenching at the axle heads. Those details matter because heavy-haul lowbed trailers see repeated load concentration and harsher structural cycling than standard route trailers.
Suspension and bushing quality affect trailer uptime
Q345 steel suspension members and polyurethane torsion-bar bushings are not cosmetic details. On project routes, mining access roads, and construction corridors, those components influence wear stability, vibration control, and long-term service predictability.
Fitment discipline is more important than chasing the lowest quote
Track, wheelbase, total width, brake package, wheel fixing, and tyre matching all affect whether the heavy-haul trailer can be assembled and serviced correctly. A cheap axle set that does not match the trailer geometry usually creates more cost later in rework, downtime, and parts mismatch.
Quotation and Procurement Guidance
This family uses range pricing because the final package depends on model mix, brake hardware, wheel-end requirements, and whether the order covers a new trailer build or a replacement and rebuild job. Serious buyers should send cargo class, target trailer drawing, axle arrangement, and destination market so the axle package can be matched correctly before shipment.
Inspection Views
Frequently Asked Questions
How is the final quotation confirmed?
KALES confirms the quotation after reviewing the required specification, quantity, destination, and delivery terms. Send the operating requirements for an accurate proposal.
Is this the right choice for a normal 3-axle flatbed or sidewall trailer?
No. This family is meant for lowbed heavy-haul and specialized multi-axle trailer work. Standard trailers usually need a simpler rear axle solution.
What is the difference between KATR30A, KATR30B, KATR40A, and KATR40B?
The models differ in rated load, brake package, wheel fixing, tyre matching, and overall dimensional geometry. KATR40B is the heaviest-rated option in this family.
Can Kales supply this family for trailer rebuilding projects?
Yes. Buyers can use this family for new heavy-haul trailer builds or for structured replacement and rebuilding projects when the existing lowbed running gear needs upgrading.
What details should I send before asking for a quote?
Send the trailer drawing, target cargo type, expected maximum load, axle arrangement, wheel and tyre preference, and destination market so the heavy-haul package can be matched correctly.
Request 3-Line 6-Axle Heavy-Haul Matching and Quote
If you are sourcing a 3-line 6-axle lowbed trailer axle set, send your trailer drawing, cargo weight, axle arrangement target, brake preference, and destination country. Kales can then match the right KATR-series package and quote the correct heavy-haul configuration instead of a generic axle offer.
Leave a Reply
You must be logged in to post a comment.