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With a high unladen weight of 28,420 kg, payload comes to roughly 8,580 kg — considerably less than the gross weight would suggest. This points to a heavily built structure of its own, as is common on vehicle carriers with their own ramps or lifting gear. Length is 13.89 m, wheelbase 11.56 m, and width 2.55 m, at the maximum width allowed for road vehicles.

Class O4 trailers run on compressed-air brakes. With such a heavy structure of its own and comparatively little remaining payload, the design focus lies on how the cargo itself is carried and secured — through ramps, lashing points or lifting mechanisms — rather than on carrying the maximum amount of bulk goods.

When buying used, pay particular attention to the operation and tightness of any ramp or lifting hydraulics, as well as the condition of the air suspension along the full length of the frame. On the long chassis, look for distortion and rust pockets on the cross members, and check the fifth-wheel coupling for wear at the kingpin. A check of the number plate light and the earth connection at the plug rounds off the inspection, as these points corrode unnoticed.