4m Ultra Tri-Axle
Drop Deck Widener Trailer
The need to choose a large quad-axle trailer and its access limitations is now a thing of the past.
The 4m Ultra Tri-Axle Widener Trailer is engineered to handle heavy haulage loads, including Class 10 combine harvesters and large excavators when fully widened, while still offering the flexibility and access of a traditional tri-axle trailer for everyday transport.
Designed for strength, versatility and performance, it delivers the best of both worlds in one heavy-duty trailer—maximising payload capacity without compromising manoeuvrability or access.
Every 4m ULTRA widener is manufactured in Ballarat using high strength steels and local suppliers and services. We back your trailer with a 5-year structural warranty and an industry-leading lead time as low as 8 weeks.
Widen to four metres for harvest, then return to standard width for everyday farm loads—giving you one trailer that works across seasons, tasks and conditions without sitting idle.
Move big machinery through tight farm entrances and regional road networks with fewer access restrictions, thanks to a tri-axle design that delivers superior manoeuvrability without sacrificing payload capacity—offering a more versatile solution that eliminates the need to step up to a larger quad-axle configuration.
Achieve the payload and performance traditionally associated with quad axle trailers—without the added size, cost or access limitations—thanks to a high-capacity tri-axle design engineered for modern agricultural machinery.
Engineered with advanced load distribution and structural integrity, the tri-axle design delivers exceptional roll stiffness—enhancing stability, reducing sway and improving safety when transporting wide, high-value machinery across varied terrain.
The Ultimate Tri-Axle for Flagship Headers
Designed and built in Ballarat, Victoria, the Brimarco Ultra 4m Tri-Axle Widener Trailer represents a new standard in Australian Design, engineering and manufacture of large agricultural transport trailers. Engineered to carry up to 31-tonne payloads at full width, it is purpose-built for today’s largest Class 10 combine harvesters while retaining the manoeuvrability and reduced road access restrictions of a tri-axle configuration. With the ability to widen to four metres without compromising payload capacity, this versatile trailer transitions seamlessly from transporting harvesters to handling hay bales and general farm freight. Developed using advanced in-house engineering and real-world testing here in Australia, it delivers exceptional strength, stability and flexibility for Australian farmers and contractors operating in demanding conditions.
Specifications
| Payload | 31t at full width |
| ATM | 44,000 kg |
| GTM | 27,000 kg |
| Deck Width | 2.5m – 4m |
| Deck Height | 0.995m |
| Deck Lengths | 13.4m (45ft model), 13.7m (46ft model), 14.3m (48ft model) |
| Overall Lengths | 13.73m (45ft road train compliant), 14.08m (46ft model), 14.63m (48ft model); custom lengths available on request |
| Axle Config | Tri-Axle |
| Availability | Made to order, call to check ex-rental/stock units |
| Est. Lead Time | 12 weeks (dependent on current production schedule) |
| Australian Designed and Built | Designed, engineered and manufactured in Ballarat Victoria. Proudly Australian Made. |
| Main Rails | 350 grade webs and flanges; 25mm lower flange, 16mm upper flange |
| Coaming Rails | 250mm and 125mm PFC with 18 chain bars |
| Flooring | 5mm 700G on decks and ramps with 31 in-deck tie down points |
| Chain Points | 31 in-deck tie down points; 18 coaming chain bars |
| Tyre Carrier | Tyre carrier suited for 19.5” spares |
| Front Gate | 1600mm high heavy-duty gate |
| Rear Ramps | Heavy-duty chain actuated bi-fold ramps; 4200mm x 900mm box tube with a 5mm 700 grade steel plate surface and welded grip strips |
| Upper Ramps | Aluminium 3-piece flip-over |
| Paint | Fully sandblasted, primed, and finished in two high quality 2-pack paint, with a choice of colours |
| Suspension | Fuwa K Hitch heavy-duty tri-axle suspension with 19.5” 8 stub hubs |
| Hydraulics | Dual acting heavy-duty 3” cylinders fit with premium valves and 12V power pack |
| Landing Gear | 2 Speed Fuwa K Hitch landing legs |
| Wheels | Steel painted rims with 265/70 19.5” tyres |
| Electrics | 175A Anderson plug, 12V lead acid battery, multi-volt LED lighting with beacon |
| Toolbox | Powder coated lockable toolbox with stainless door (1200mm x 350mm x 400mm) |
| Water Tank | Polished 60L aluminium water tank |
| Oversize Signage | Custom spring-loaded flip-over signs |
| Flag Holders | Front and rear flag holders |
Aggregate Trailer Mass (ATM) is the total maximum weight of a trailer when unhitched, including its payload. Gross Trailer Mass (GTM) is the maximum weight supported by the trailer’s axles when hitched to a vehicle.
Optional Trailer Features
- Roadtrain provision and coupling
- Customised deck tie-down layouts
- Extra wide ramps
- Customised lighting and electrical systems
- Petrol, diesel or PTO hydraulic systems
- Hub-odometers, RightWeigh gauge, and telematic systems
- Alloy and spare wheels
- 3-way container pins
- Stainless coaming rail protectors and vinyl scrollwork
- Electric winch
- Custom deck lengths
Resources & Downloads
Product Brochure |
Dimensions
| Length | Deck | Other | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Model | OL | DL | TD† | BD | DH | KH | KP | LL | AC | AS | RO |
| Road Train | |||||||||||
| IRF | 13.73 (45ft) | 13.4 | 4.3 | 9.1 | 0.995 | 1.27 | 1.43 | 2.15 | 9.15 | 1.8 | 3.15 |
| Standard | |||||||||||
| IAF | 14.08 (46ft) | 13.7 | 4.3 | 9.45 | 0.995 | 1.27 | 1.43 | 2.15 | 9.5 | 1.8 | 3.15 |
| Maximum | |||||||||||
| IMF | 14.63 (48ft) | 14.3 | 4.3 | 10 | 0.995 | 1.27 | 1.43 | 2.15 | 9.5 | 1.8 | 3.7 |
Legend
Note: All dimensions are listed in metres (m)
†Top deck length includes flip over ramp in position shown. For custom lengths or other special requirements please contact Brimarco directly. ^Payload refers to engineered structural capacity. On-road limits depend on local regulations and vehicle configuration. *5 Year Warranty applies to structural defects only.
Frequently Asked Questions
A tri-axle widener offers excellent manoeuvrability, reduced road access restrictions and lower operating complexity, while still delivering the payload capacity required for large agricultural machinery—eliminating the need for a bulkier quad-axle setup.
Yes, all Brimarco trailers are covered by a 5-year structural warranty.
A tri-axle widener offers excellent manoeuvrability, reduced road access restrictions and lower operating complexity, while still delivering the payload capacity required for large agricultural machinery—eliminating the need for a bulkier quad-axle setup.
The Brimarco Ultra 4m Tri-Axle Widener is engineered to carry up to a 31-tonne payload at full width, making it ideal for transporting modern Class 10 combine harvesters while maintaining stability and compliance.
All Brimarco trailers are designed, engineered and manufactured in Ballarat, Victoria with materials and services from local suppliers, using advanced in-house engineering and real-world testing to ensure they perform in demanding Australian conditions.
Use Cases
- Header / Combine Harvester Transport
- Excavation Equipment Transport
- Forestry Equipment Transport
- Large Tractor Transport
- General Freight
Brimarco Customer Testimonials
Why Choose Brimarco?
Australian Design
Every Brimarco trailer begins with Australian design thinking. Developed in Ballarat to suit local conditions, machinery and road networks. Purpose-built solutions ensure optimal performance, durability and compliance from day one.
Australian Engineering
Engineered in-house using advanced modelling and real-world testing, Brimarco trailers are designed for strength, stability and reliability, delivering high-performance transport solutions for demanding agricultural and civil applications.
Australian Manufacturing
Built in Ballarat, Victoria, each trailer is manufactured with precision and care using high-quality materials, ensuring consistent quality, faster turnaround times and equipment you can rely on in the field.
Local Support
When you work with Brimarco, you deal directly with the people who design and build your trailer. That means faster answers, practical advice and genuine support when you need it most.
Over 50 Years Experience
Backed by decades of industry experience, Brimarco combines proven knowledge with modern innovation, delivering custom trailers and custom movable facilities that are trusted to perform across Australia’s toughest conditions.
Genuine People
We believe in straight answers and strong relationships. Our team takes a hands-on, honest approach, always working closely with our customers to deliver solutions that suit their operation, not a standard specification sheet.
Enquire Now
Fill out the form below and we will be in touch.
