The Axles Go Where the Load Goes.
TRT Full Widener Low Loaders are built for transporting wide plant and machinery with greater stability, strength and control.
Available in both tri axle and quad axle configurations, these trailers widen from 2.5m closed to 3.5m open, allowing the trailer to match the width of the machine being carried. The wheels widen with the deck, helping maximise stability when moving wider loads across demanding sites, roads and operating conditions.
Built with high tensile steel, full-depth chassis construction and TRT’s low loader know-how, they are made for operators who need a trailer that works hard, loads confidently and keeps delivering for the long haul.
Built to match the machine.
When you are moving wider machines, stability matters.
A TRT Full Widener Low Loader is designed to widen to the width of the plant and equipment being transported. That gives operators a more stable platform for wider loads, while still closing to 2.5m for travel when required.
Choose a tri axle full widener for lighter plant and equipment applications, or step up to a quad axle full widener when your payload requirements, operating conditions or customer needs call for greater capacity.
Both options are engineered, built and supported by TRT.
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Full Axle Widening
The entire axle group moves outward with the deck, keeping the trailer's wheel track aligned with the width of the machine being transported.
The load sits directly over the axles rather than extending beyond them. That alignment delivers maximum lateral stability at every width position, on every road condition. -
Six Selectable Width Increments
The trailer widens in defined steps from closed road position to fully open, with multiple positions available between.
The operator selects the width that fits the machine rather than defaulting to maximum. That precision reduces tyre scrub, lowers fuel consumption, and keeps the vehicle profile as narrow as the load allows. -
Double-Acting Hydraulic Suspension
Double-acting hydraulic suspension manages load distribution dynamically across all axles, holding stability when ground conditions change or load shifts during transport.
It is standard on the quad axle configuration and available as an option on the tri axle. Each axle can also be raised or lowered independently under hydraulic control. -
Widening Stool
When widening on site, the widening stool lifts all wheels clear of the ground before the axles move outward.
The tyres do not drag or scuff across the road surface, protecting both the bitumen and the tyres. Widening happens cleanly and without resistance, every time. -
Independent Axle Lift
Every axle can be raised independently without jacks or support equipment.
For roadside tyre changes or servicing, that means faster turnaround without extra tools on the job. It also allows the operator to adjust axle loading on site when ground conditions or permit requirements demand it. -
Grade 80 High Tensile Chassis
The chassis is fabricated from grade 80 high tensile steel in an I-beam profile, with the axles set through the chassis rather than mounted below it.
That construction places the deck as low as the axle geometry allows while keeping the structure rigid under full load. Less deflection, longer structural life, and the lowest available deck height for the axle configuration. -
Rear Steer Options
One or two rear steer axles are available on the quad axle configuration.
Steering axles reduce tyre wear and chassis stress on long hauls, lower fuel consumption by reducing rolling resistance in corners, and improve manoeuvrability on tight sites and winding roads. For operations mixing highway runs with constrained access sites, rear steer pays back across the life of the trailer.
Capacity Across the Range
TRT Full Widener Low Loaders are available in tri axle and quad axle configurations, covering payloads from 30 tonnes up to 50 tonnes with a dolly on a quad.
Both widen from 2.5m closed to 3.5m open in six increments.
Contact TRT for configuration-specific drawings and specifications for New Zealand and Australia.
Not sure which configuration suits your payload?
The right configuration depends on what you're moving and where.
Talk to the TRT team about your payload, your site conditions, and your deck length requirements.
We will get the right trailer specified and built to your requirements across New Zealand and Australia.
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Frequently Asked Questions
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What is the difference between a full widener and a deck widener?
A full widener moves the entire axle group outward with the deck, so the trailer's wheel track matches the width of the machine being transported.
The load sits directly over the axles, which gives maximum lateral stability at any width position. A deck widener extends the deck only, with the axles remaining at 2.5m regardless of deck width.
Deck widening is the better choice where road access is tight and the trailer needs to stay narrow.
Full widening is the better choice where stability under a wide, heavy load is the priority. The TRT team can help you work out which suits your operation.
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How do I choose between tri axle and quad axle?
The primary factor is payload. The tri axle configuration suits loads up to 30 tonnes and has a shorter deck and lighter tare weight, which suits operations where machine size and weight are in that range.
The quad axle configuration handles up to 35 tonnes on its own axle group and up to 50 tonnes when combined with a dolly, making it the right choice for heavier plant.
The quad also comes with double-acting hydraulic suspension as standard and rear steer options that improve manoeuvrability on complex sites.
Talk to the TRT team about your typical loads and they will confirm which configuration makes sense.
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Does the widening stool protect the road surface when widening?
Yes. The widening stool lifts all wheels clear of the road before the axle group extends.
The tyres do not drag or scuff across the surface during widening.
This protects sealed roads and yards from damage and keeps the widening mechanism operating smoothly.
It is particularly important for operators working on new seal or in yards where surface damage would create liability.
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What rear steer options are available, and who needs them?
One or two rear steer axles are available on the quad axle configuration. Steering axles reduce the trailer's turning radius, which makes a meaningful difference on winding roads, in tight yards, or on sites with constrained access.
They also reduce tyre wear and chassis stress through corners, and lower fuel consumption by reducing rolling resistance. For operations that mix open highway work with access to constrained sites, rear steer generally pays back across the service life of the trailer.
The TRT team can advise on whether one or two steer axles is the better fit for your routes and site conditions.
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Can TRT build this trailer to a custom deck length?
Yes. TRT builds full widener low loaders to the deck length your machines require. Standard deck lengths are available and are suitable for most applications, but if your payload falls outside those dimensions the team can manufacture to your specification.
Get in touch with the machine dimensions and we will confirm what is achievable and provide a build quote across New Zealand and Australia.
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What after-sale support does TRT provide for trailers?
TRT supports its trailers across New Zealand and Australia. The trailers team can advise on maintenance schedules, assist with any issues after delivery, and supply parts where needed.
TRT has been manufacturing and supporting heavy transport equipment for more than three generations, and that experience is available to you after the trailer leaves the factory.
Reach the team through the TRT website or your nearest branch.
Need a wider, more stable way to move plant?
Talk to TRT about a Full Widener Low Loader built around your machines, payload and operating environment.
From tri axle to quad axle, standard setups to custom requirements, we can help specify the right widening low loader for the work you do every day.