Special Trailers
Hydraulic Modular Trailer
The SIGMA hydraulic modular trailer couples axle lines behind a tractor unit to carry loads that exceed what a lowbed trailer can legally take.
Over 10 years of manufacturing excellence, trusted by clients in 50+ countries.
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Overview
A hydraulic modular trailer is towed, not self-driven: the tractor unit supplies the power and the trailer supplies the axle lines, the hydraulic suspension and the steering. Lines couple side-by-side for wide loads or end-to-end for long ones, so the same set of modules handles a transformer this month and a bridge girder the next. Each line carries up to 40 tons and rides on independent hydraulic cylinders, which keeps the deck level over ramps, kerbs and the ground settlement that heavy-haul routes are full of. Where the load is heavy but still fits a conventional deck, a lowbed or RGN trailer is the cheaper answer — the modular build earns its cost when the load is genuinely oversized.
Features
- Modular axle lines couple side-by-side or end-to-end to match any load width or length
- Independent hydraulic suspension per axle line keeps the deck level over ramps and uneven ground
- Hydraulic deck height adjustment of ±300 mm loads and unloads without a crane on some jobs
- Steering lines follow the tractor through curves that would bind a fixed-axle trailer
- Scales from a 2-line unit to 12-line combinations as the project demands
- Towed by a standard heavy-haul tractor — no separate power pack to buy, fuel or maintain
- Built for transformer moves, bridge girder placement and industrial plant relocation
Applications
- Transformer and industrial plant equipment transport
- Bridge girder and precast segment haulage
- Wind turbine tower section transport
- Mining and quarry equipment relocation
- Oversized and abnormal load projects
- Port and heavy-lift terminal haulage
When a Modular Trailer Beats a Lowbed
A modular trailer earns its cost on three things a fixed-axle trailer cannot do: spread the load across more axle lines than one chassis can carry, adjust the deck height hydraulically under load, and change its own length and width to match the next job. Below roughly 100 tons, a lowbed trailer or RGN trailer does the same work for a fraction of the price. Above that, or when the load is wider than a standard deck, the modular build is the only legal way to move it.Towed Modular Trailers vs Self-Propelled Units
Self-propelled units carry their own diesel power pack and drive every axle line — they are used for shipyard and refinery moves where there is no room for a tractor unit. SIGMA supplies the towed hydraulic modular trailer, which is pulled by a conventional heavy-haul tractor. For road-going project cargo this is the normal choice: lower purchase price, no power pack to fuel and service, and any adequately rated tractor in your fleet can pull it.Configurations
Frequently Asked Questions
Do you sell self-propelled modular trailers (SPMT)?
No — SIGMA's modular trailer line is a towed hydraulic modular trailer, pulled by a standard heavy-haul tractor rather than carrying its own power pack and driving every axle line. Self-propelled units (SPMT) are used mainly for shipyard, refinery and confined-site moves where there's no room for a tractor. For road-going project cargo, the towed configuration is the standard choice and costs meaningfully less to buy and run.
What's the practical difference between a self-propelled trailer and a towed modular trailer?
A self-propelled trailer drives itself off an onboard diesel power pack, so it needs no tractor but does need its own fuel, servicing and a trained operator for the power unit. A towed modular trailer instead couples to whatever heavy-haul tractor the customer's fleet already runs, which is why most road transport companies buying modular trailers order the towed version rather than SPMT.
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