Heavy hauler

Self-propelled modular transporters (SPMT), some featuring a dozen or more self-steering axles with scores of rubber tires to spread out a load, are increasingly being manufactured.

In some cases, a heavy hauler is designed and constructed to move a particular load on a one-off or short-term basis.

[1] Girder bridge (lowboy) trailers are another specialist heavy hauler, specifically for the transport of large power transformers.

[citation needed] Typical loads moved by heavy haulers under escort on highways include giant boilers and pressure vessels used in the chemical industry, industrial plants, prefabricated sections for construction projects, giant power transformers, turbines, and houses (generally made of timber).

The term "heavy hauler" may also be used to refer to off-road dump trucks and ore carriers used in mining and construction with capacities up to 400 tonnes (390 long tons; 440 short tons), or an airplane that has been especially constructed for moving heavy materials.

Two MAN SE ballast tractors pulling and one Mercedes pushing a 100,000 kg (220,000 lb) transformer on 10-axle lowboy trailer
ALMA antenna in transit on a self-propelled modular transporter
A Mammoet SPMT moves a large ship section.