Fifth Wheels
JOST Australia supplies fifth wheels for heavy vehicle and semi-trailer applications, with standard and heavy duty options available for different transport requirements.
The right fifth wheel coupling helps keep the prime mover and trailer connected, stable and ready for work. For Australian fleets, workshops and trailer builders, that means safer trailer connection, smoother handling and dependable day-to-day operation.
Not sure which fifth wheel you need?
The right choice depends on the prime mover, trailer, king pin, load type, operating environment and how often the vehicle is coupling and uncoupling.
For general freight, linehaul, regional transport and everyday semi-trailer work, a standard fifth wheel is often the right fit.
For heavier work, rougher site conditions, road train applications or operations where the coupling is under greater load stress, a heavy-duty fifth wheel may be more suitable.
Why does fifth wheel quality matter?
A fifth wheel does more than connect the prime mover and semi-trailer. It needs to handle load, movement, road conditions and daily coupling demands without creating avoidable wear or downtime.
That is why quality, correct fitment and application suitability matter. The right fifth wheel helps support safer coupling, smoother trailer movement and more reliable day-to-day operation.
Standard vs heavy-duty fifth wheels
Standard fifth wheels | Heavy-duty fifth wheels | |
Best suited for | General heavy vehicle and semi-trailer applications | Tougher transport applications and higher load demands |
Common applications | General freight, linehaul, regional transport, tippers, tankers and fridge trailers | Heavy haulage, road train work, construction transport, waste and specialised trailer combinations |
Operating conditions | Consistent day-to-day transport conditions | Rougher conditions, heavier loads and more intensive use |
Built for | Reliable coupling, practical operation and everyday durability | Added durability, strength and support for harder-working vehicles |
Typical users | Fleets, workshops and trailer builders managing regular transport work | Fleets and operators working in demanding or specialised applications |
How do you choose the right fifth wheel?
The right fifth wheel depends on the prime mover, trailer, king pin, load type and operating conditions.
Vehicle and trailer setup
Check the prime mover, trailer, king pin and coupling requirements before choosing a fifth wheel.
Load demands
Consider the weight being carried, the type of work and how hard the vehicle operates day to day.
Coupling height and clearance
Make sure the fifth wheel height and trailer clearance suit the combination and allow safe operation.
Maintenance access
Choose a fifth wheel setup that allows easy access for servicing, inspections and regular maintenance.
Where are fifth wheels commonly used?
Fifth wheels are used across a wide range of heavy vehicle and trailer applications, including:
- Freight and logistics fleets
- Linehaul and regional transport
- Semi-trailer combinations
- Road train applications
- Tipper and tanker work
- Fridge and general freight trailers
- Trailer manufacturing and fit-out
- Workshop replacement and servicing
- Construction transport
- Waste and bulk transport
- Heavy-duty and specialised transport applications
Why choose JOST Australia?
Practical fifth wheel options
JOST Australia supplies standard and heavy duty fifth wheels for different heavy vehicle, trailer and fleet applications. This helps operators choose a fifth wheel that suits the truck, trailer, load and operating conditions.
Built for heavy vehicle work
JOST fifth wheels are designed to support reliable coupling, trailer movement and day-to-day durability across transport, freight, construction, waste, road train and specialised trailer applications.
Connected truck and trailer range
The JOST range includes fifth wheels, fifth wheel sliders, king pins, landing legs, turntables, tow couplings and related trailer components. This gives fleets, workshops and trailer builders access to products that work together across the full truck and trailer setup.
National after-sales service and support
JOST Australia supports customers with national after-sales service, product support and access to replacement parts. For fleets and workshops, that means help is available beyond the initial purchase, supporting maintenance, uptime and long-term operation.
Frequently Asked Questions
A fifth wheel is used to connect a prime mover to a semi-trailer. It works with the trailer’s king pin to create a secure coupling point while allowing the trailer to pivot during turning.
Standard fifth wheels are generally suited to regular heavy vehicle and semi-trailer work. Heavy duty fifth wheels are designed for more demanding applications where higher loads, tougher conditions or more intensive use may be involved.
Start with the prime mover, trailer, king pin, load type and operating conditions. A vehicle doing regular freight work may need a different fifth wheel from one working in heavy haulage, road train, construction, waste or mixed site conditions.
Yes. Fifth wheels should be inspected and maintained as part of a regular vehicle servicing programme. This helps manage wear, lubrication, locking function and safe operation.
Need help finding the right fifth wheel for your truck, trailer or fleet?
Contact JOST Australia to discuss standard and heavy duty fifth wheel options for your operation.