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Trailis D-651.21 – EU class O4 semi-trailer with a 26,000 kg gross weight, 13.49 m length and 25,000 kg unladen weight, built in 2009
The Trailis D-651.21 belongs to the class of heavy low-loader semi-trailers built to carry construction machinery and other heavy, indivisible loads. With a gross weight of 26,000 kg it falls into EU trailer class O4, the heavy trailers above 10 tonnes.
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The register lists an unladen weight of 25,000 kg for this vehicle. Length is 13.49 m, wheelbase 8.79 m, and width 2.55 m, at the maximum width allowed for road vehicles. Such a high unladen weight is not unusual on reinforced low-loaders built for extremely heavy single loads, whose frame alone already accounts for much of the rated gross weight.
Class O4 trailers run on compressed-air brakes. With such a massively built structure of its own, the design focus lies on a torsion-resistant, highly load-rated frame rather than maximum remaining payload, so that even heavy loads applied at concentrated points are carried safely.
When buying used, distortion and cracking on the reinforced frame deserve particular attention, as does the condition of the air suspension along the full length and the tightness of the air lines. At the fifth-wheel coupling, check for wear at the kingpin, and on the axles, look for even tyre wear as a sign of sound axle geometry. The condition of the mudguards and the lashing points along the frame is worth a look as well, since both take steady wear in daily use.
Sources: SpecCodex-Register: Kennwerte des Modells D-651 .21
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