“Lowbed” is not a single trailer — it is a family of configurations, each suited to a different kind of load. Choosing the right one is the first engineering decision in any heavy move, because the trailer determines the deck height, the loading method, the stability and ultimately whether the load stays within road limits. This guide explains the main configurations and when each is used.
Why a lowbed at all?
A standard flatbed sits high off the ground. Put a tall machine on it and the total height quickly breaches bridge and gantry clearances. A lowbed (also called a low-loader or float) solves this with a deck that drops down between the gooseneck and the rear axles, sitting much closer to the road.
That low deck does two things: it keeps tall cargo under height limits, and it lowers the load’s centre of gravity, which is what keeps heavy machinery stable through braking and cornering. For most plant, earth-moving equipment and over-dimensional cargo, a lowbed is the default. You can see the full Waytrans fleet here.
The main lowbed configurations
Front-ramp and rear-ramp lowbeds
Ramps let wheeled and tracked machinery — excavators, dozers, loaders — drive directly onto the deck. Rear-ramp trailers load from behind and are the workhorse for self-propelled plant. Front-ramp designs load over the gooseneck and suit specific machine types and site layouts. The choice often comes down to how the machine can safely be driven on and off at both ends of the journey.
Drop-deck (step-deck) trailers
A drop deck has a stepped profile — a higher front section and a lower main deck. It is the right call when cargo is too tall for a flat trailer but does not need the full depth of a deep lowbed. Drop decks give you height clearance without the loading complexity of a deep well.
Extended lowbeds
When a load is longer than a standard deck — long structural sections, lengthy machinery, oversized beams — an extended (telescopic) lowbed stretches to support the cargo along its full length. Supporting a long load properly prevents overhang stress and keeps the rig legal and stable.
Dolly trailers
For the heaviest and most sensitive machinery, dolly trailers add axle lines and allow modular configurations that spread extreme weight across more of the road and give fine control when manoeuvring. They are used where a single fixed trailer cannot distribute the load or negotiate the move precisely enough.
Lengths matter as much as type
Waytrans operates lowbeds in 12, 15, 18, 24 and 30-metre lengths. Length is not just about fitting the cargo on — it affects axle loading, turning behaviour and how the weight is distributed across bridges and road surfaces during the route survey. A load that is well within weight limits can still be non-compliant if it is concentrated over too few axles.
Flatbed and box trailers still have their place
Not every industrial load needs a lowbed. Standard cargo that is within height limits often moves more efficiently on a flatbed (open deck) or a box trailer (enclosed, for cargo that needs protection from weather or in transit). Waytrans runs flatbed and box trailers in the same broad range of lengths for exactly this reason — the goal is always to match the trailer to the load, not to over-specify.
How the right trailer gets chosen
In practice, the selection comes down to four questions:
- How heavy is it, and how is that weight distributed? This drives the axle configuration and length.
- How tall is it on the deck? This decides between flatbed, drop deck and deep lowbed.
- How will it be loaded and unloaded? Driven on (ramps), craned on, or jacked and skidded into place.
- What does the route allow? Confirmed against the survey before anything moves.
A good heavy-transport partner runs this assessment up front, so the trailer that turns up is the one the job actually needs.
If you have a machine or an over-dimensional load to move, share its weight and dimensions and request a quote — we will confirm the right lowbed configuration and the compliant route to go with it.