Heavy Haulage Trailers

A heavy haulage trailer is a specialised semi-trailer engineered to transport loads that exceed standard freight limits in weight, width, height, or length — typically machinery, mining equipment, industrial plant, and oversized structures that cannot be broken down for transport. Unlike standard semi-trailers, heavy haulage trailers use multiple axle configurations (tri-axle or quad-axle) to distribute load across a greater number of wheels, allowing aggregate trailer masses of up to 55 tonnes while remaining compliant with Australian Design Rules and NHVR permit requirements.

Midland's heavy haulage trailers are perfect for transporting large, heavy items such as construction equipment, mining machinery, prefabricated components, and oversized structures. Their design caters to a wide range of heavy haulage applications.

Quality is paramount at Midland. We utilise Australian steel in our manufacturing process, which is renowned for strength and durability. Each trailer undergoes rigorous testing and quality checks to ensure it meets our high standards and can withstand the demands of heavy haulage.

Midland heavy haulage trailers are available in Quad Axle, Tri Axle, and custom multi-axle configurations. Quad axle is the most common for high-ATM loads, distributing mass across four axle groups to meet road access requirements. Suspension options include spring and airbag. Axle spacing and spread can be specified to suit your PBS assessment or route access conditions.

Heavy haulage trailers are used in mining, construction, civil infrastructure, oil and gas, renewable energy, and defence. Common applications include transporting excavators, dozers, drilling rigs, transformers, wind turbine components, precast bridge beams, and oversized industrial plant. Any freight that exceeds standard access dimensions or mass limits requires a heavy haulage trailer and route permit.

Under NHVR guidelines, loads wider than 2.5 metres or taller than 4.3 metres are classified as overdimensional and require a permit before moving on public roads. Loads exceeding 25 metres in length also require a permit. Permits specify approved routes, travel times (often daylight or off-peak only), pilot vehicle requirements, and any required utility or road authority notifications.

No. We only manufacture and provide trailers in Australia and do not facilitate international orders. However, our trailers are available to order across Australia and we deliver to many locations. Alternatively, if you’d prefer, you can also opt to collect your trailer. Once we’ve discussed the specifics of your trailer and your location, our team will arrange the best solution for getting your trailer to you.

Heavy haulage loads that exceed standard dimension or mass limits must obtain an Over-Dimensional permit from the National Heavy Vehicle Regulator (NHVR) before travelling on public roads. Permit requirements are triggered when a load exceeds standard width (2.5m), height (4.3m), or the applicable General Mass Limits for the axle configuration. The specific permit class, travel conditions, approved routes, and pilot vehicle requirements depend on the load’s dimensions and the road network involved. All Midland heavy haulage trailers are engineered to NHVR compliance standards and can be configured to suit your permit conditions. For current permit requirements, visit https://www.nhvr.gov.au.

A standard semi trailer operates under general access conditions (up to 42.5T GCM, 2.5m wide, 4.3m high). A heavy haulage trailer is engineered for loads that exceed those limits — higher ATM (up to 55T), greater width, and specialised axle configurations. Heavy haulage trailers require NHVR overdimensional or overmass permits and operate under specific route approvals that standard semi trailers do not need.

Yes. Every heavy haulage trailer Midland manufactures is built to order. We work with you on deck length, axle configuration, suspension type, kingpin position and load securing points to match your specific payload. Standard ATM up to 55T, with higher-rated builds available for approved PBS combinations.

Midland’s heavy haulage trailers are rated up to 55T ATM as standard. Actual payload depends on the prime mover’s tare weight and the combination mass limit for your route. Under a PBS approval, higher mass limits may apply depending on the axle configuration and road network access level.

Contact Midland directly by phone or through the website quote form. To get an accurate quote, have your payload weight, freight dimensions, axle configuration preference and delivery state ready. Our team will assess your requirements and provide a build proposal typically within 48 hours.