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Fesan 3FSN10 – three-axle O4-class trailer built in 2021: 42,000 kg gross weight, 35,000 kg payload, 110 km/h top speed.
With a gross weight of 42,000 kg, the Fesan 3FSN10 sits well above the 10-tonne threshold of EU trailer class O4. The body rests on three axles with six wheels in total, a layout that at this weight class keeps axle load within limits the road and tyres can tolerate.
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With an unladen weight of 7,000 kg, payload comes to 35,000 kg, five-sixths of the gross weight. At 13.83 m long, 2.55 m wide and with an 8.83 m wheelbase, the 3FSN10 is a long, three-axle semi-trailer. Unusually for a trailer of this weight class, top speed is raised to 110 km/h, above the otherwise standard 100 km/h.
Three-axle O4 trailers run on air brakes and typically on air suspension. The raised top speed of 110 km/h for this class calls for correspondingly rated tyre and brake technology, as found on semi-trailers optimised for long-distance haulage. Towing it as a combination requires licence category CE in the EU.
When buying a used heavy-load semi-trailer rated for higher speed, it is especially worth checking the tyres for speed rating and condition, the air suspension for even damping across all three axles, the brake system for effectiveness at higher speed, and the frame for fatigue cracking caused by sustained higher running speed. It is also worth confirming that the tyres actually fitted carry a speed rating matching the trailer's approved top speed.
Sources: SpecCodex-Register: Kennwerte des Modells Fesan 3FSN10, Zulassungsdaten RDW (Niederlande)
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