Drop Deck Trailers in Perth

Drop deck trailers are primarily used for transporting tall machinery, earthmoving equipment, construction plant, and oversized loads that wouldn't fit within legal height limits on a standard flatbed. The two-tier design, with upper and lower decks, allows taller cargo to sit on the lower deck while smaller items can be carried on the upper deck, maximising the cubic capacity of each load.

Common applications across WA include moving excavators, graders, and loaders between construction and mining sites, transporting concrete panels for civil and building projects, and carrying large agricultural equipment across regional routes. The drop deck curtainsider variants among our deck trailers also handle high-volume palletised freight that benefits from both side access and increased internal height.

The lowered deck section reduces the overall height of the load on the trailer, allowing taller equipment to be transported while staying within Main Roads WA's legal height limit of approximately 4.3 metres. This eliminates the need for expensive oversize permits on many loads that would otherwise require them on a standard flatbed. For operators regularly moving tall plant and machinery, this is a significant cost and time saving.

Our Perth range of drop deck trailer configurations covers standard, tri-axle, and quad-axle options, with ATM ratings varying depending on axle setup and state regulations. The standard 45-foot drop deck handles ATM ratings of 45–47 tonnes with a payload of up to 28 tonnes.

The tri-axle widener matches those ATM ratings and adds deck width for oversized loads. The quad-axle widener steps up to 60 tonnes ATM and 36 tonnes GTM, making it the heaviest-duty option in the range, fitted with a front lift-up and rear steer axle for tight manoeuvring under load.

AAA Trailers' drop decks are available with airbag suspension or spring suspension, depending on your load type and operating conditions. Airbag suspension provides a smoother ride and better load protection, making it well suited to sensitive or high-value freight on sealed roads. Spring suspension is a more robust option for rougher terrain and heavy-duty applications. Our Perth team can advise on the best suspension option for your specific haul requirements. Contact us on 1300 333 888 to discuss.

All ramp-equipped models in our drop deck trailer range feature bi-fold ramps for loading and unloading heavy machinery directly onto the deck. Bi-fold ramps fold in two sections, keeping the ramp profile compact when stowed while still providing a gradual, stable loading angle for excavators, tractors, and other heavy plant. The extendable drop deck model also uses bi-fold ramps, maintaining consistent loading capability even at extended lengths.

AAA Trailers' drop decks are built with strong cross members, multiple tie-down points, and winch tracks along the deck, creating an ideal bond between load and deck for heavy plant and machinery transport. 

These restraint points are visible and accessible along the full deck length, making it straightforward to secure varied load types compliantly.

The lower centre of gravity inherent to the drop deck design also contributes to load stability, reducing the risk of overturning on long hauls and on WA's varied regional road conditions.