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Ffg DAH 18 W – O4-class trailer built in 2010: 18,000 kg gross weight, 10,810 kg payload, four-wheel tandem-axle chassis.
With a gross weight of 18,000 kg, the DAH 18 W falls into EU trailer class O4, well above the 10-tonne threshold. As with several trailers of this weight class, the type designation points to the gross weight: "18" stands for 18 tonnes gross weight.
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With an unladen weight of 7,190 kg, payload comes to 10,810 kg. The trailer runs on four wheels, i.e. a tandem axle, with a 4.20 m wheelbase. At 8.00 m long and 2.55 m wide, the DAH 18 W is a comparatively compact vehicle for its weight class, with a wheelbase that is narrow relative to its length.
From class O3 upwards, trailers are generally fitted with air brakes rather than the simple overrun brake used on light trailers. Towing it as a combination requires licence category C1E or CE in the EU, depending on combined train weight. The compact ratio of length to weight class points to a design built for concentrated, heavy loads rather than voluminous cargo.
When buying a used compact tandem-axle heavy-load trailer, check the axle suspension for play and uneven wear, the brake drums or discs for scoring, the frame around the axle mounts for cracking from concentrated load, and the load bed for deformation from point loads. It is also worth checking the tow eye and the parking-brake linkage for smooth, unobstructed operation on both sides of the chassis.
Sources: SpecCodex-Register: Kennwerte des Modells Ffg DAH 18 W, Zulassungsdaten RDW (Niederlande)
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