Dolly Trailers in Perth

A converter dolly is used to link a semi-trailer to another trailer in a road train combination. The dolly sits between the two trailers, with its turntable coupling to the front of the second trailer and its drawbar connecting back to the rear of the lead trailer. This is the standard method for building B-train and road train combinations in Australia, designed to link vehicles seamlessly. And it's widely used across long-haul transport, mining supply routes, bulk haulage, and container freight operations across WA and into remote areas.

A converter dolly is used to join trailers together in a multi-trailer road train combination, acting as the linking unit between trailer 1 and trailer 2. Its primary function is articulation and connection. A load share dolly, by contrast, is used to redistribute weight across vehicles and axle groups, including when paired with a low loader — transferring load from a heavily weighted axle group onto additional axles, reducing strain on the prime mover and keeping the combination within legal mass limits. The tandem axle load share dolly in our range has a 33-tonne ATM and airbag suspension, making it well-suited to heavy-payload applications where axle weight management is critical.

Yes. AAA Trailers' Canning Vale workshop stocks a full range of quad axle low loader trailers alongside our dolly range, including a standard deck widener model and a front lift-up, rear steer variant for tight site work. A load share dolly pairs directly with low loader combinations to manage axle weights on heavy hauls. Visit our Quad Axle Low Loader Trailers Perth page to explore the full range.

Both converter dollies are built with high-tensile steel mainframes and K-Hitch running gear, but they differ in axle count, dimensions, and weight distribution capability. The tandem axle model (6.32m long) runs two axles with an 18-tonne ATM, suitable for the majority of B-train and road train applications across WA. The tri axle model (6.02m long) runs three axles, which spreads load across a greater number of tyres — providing better stability and higher effective load capacity for heavier freight tasks. If you're regularly running at or near maximum mass, the tri axle is the more capable option.

The tandem axle converter dolly runs FUWA FW520 8-leaf spring suspension as standard, with the optional upgrade to air suspension for a smoother ride on sealed roads and longer hauls. The tandem axle load share dolly runs airbag suspension as standard, which is the better choice for sensitive loads and high-frequency freight operations where ride quality matters. The tri axle converter dolly uses spring suspension. Our Perth team can advise on which setup best suits your operating routes and load types.

The tandem axle converter dolly uses a 50mm SAF tow eye and bolt-in turntable for a secure, high-strength coupling between the drawbar and the lead trailer's rear connection point. The kingpin coupling on the dolly's turntable connects to the fifth wheel of the following trailer. This system is the industry standard for Australian road train combinations and is built to handle the articulation forces generated when linking heavy vehicles in multi-trailer operations. Full air, electrical, and safety connections are required and included — allowed to comply with long-haul operational and regulatory requirements across Australian states.

The tandem axle converter dolly can be fitted with a road train kit and a spare wheel as optional additions. Full LED lights are standard across the range for all-condition visibility. Our Perth team can discuss additional configuration options at the time of order. Contact us on 1300 333 888 to go through what's available for your specific combination.

Yes. Competitive financing options are available across the dolly trailer range. You're welcome to have your own broker complete an independent inspection before purchase. Contact our Perth team on 1300 333 888 to discuss your options.

Yes. Custom paint colour is available at no extra charge across the dolly range. Custom builds take longer than standard stock units as they're constructed from the ground up, so contact our Perth team early if you have specific requirements.

All AAA Trailers dolly trailers come with a 12-month (one year) warranty covering defects in materials and workmanship under standard operating conditions. Standard warranty terms apply from the date of handover. Pre- and post-sales support is available through our Canning Vale workshop in Perth, including operational advice and help with servicing to keep your dolly in top condition.

If you're looking for dolly trailers for sale in Perth, visit our contact page and fill out the enquiry form, call us on 1300 333 888, or come into our Canning Vale workshop. Beyond Perth, we have a location in Sydney and across NSW, as well as branches in Melbourne, Adelaide, and Brisbane. This means operators across NSW and interstate can also reach their nearest team directly. We'll discuss your combination setup, load requirements, and preferred axle configuration to match you with the right unit from our range.