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Seidler 18BPA: eight-wheel trailer, built 2017, gross weight 18,000 kg, EU category O4, wheelbase 4,980 mm, payload 13,940 kg
Built in 2017 with a gross weight of 18,000 kg, the 18BPA falls into EU trailer category O4. Eight wheels on a 4,980 mm wheelbase point to a compact multi-axle layout with dual tyres, carrying high axle loads on a short footprint rather than spreading the axles wide apart.
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At a length of 8,800 mm and a width of 2,550 mm, the unladen weight is 4,060 kg and the payload 13,940 kg. More than three-quarters of the gross weight is therefore available for cargo, a high share for such a compact trailer, suggesting a design built for concentrated heavy goods rather than bulky loads.
Category O4 requires air brakes acting across several axles at eight wheels. Towing vehicles need driving licence category CE or C1E, matched to the combination's permitted gross weight. Dual tyres spread the axle load across more contact area and are the norm rather than the exception at this weight class.
Buying used, with dual tyres the first check is even wear on both wheels per side; uneven wear points to a skewed axle or a brake problem. The air brake system needs checking for leaks, the axle bearings for play, and the frame around the axle mounts for cracks that can form under this axle load over time. Comparing tread depth on both sides of each axle is worthwhile too, since a difference built up over years of use throws the brakes out of balance.
Sources: SpecCodex-Register: Kennwerte des Modells 18BPA
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