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Klaesi AFL 7.1: a single-axle EU class O3 trailer with a 7,100 kg gross weight, 6.70 m overall length and a payload of 4,830 kg
With a gross weight of 7,100 kg, the AFL 7.1 sits in EU trailer class O3, the band between 3.5 and 10 tonnes where the simple overrun brake used on lighter classes reaches its limit. Trailers of this size are pulled by agricultural and commercial towing vehicles and carry considerably more than the common light trailers under 3.5 tonnes.
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At a kerb weight of 2,270 kg, the payload works out to 4,830 kg, more than double the trailer's own weight. At 6.70 m long and 2.20 m wide, the AFL 7.1 is a slender, long body carried on a single axle: the distance from the coupling to the axle is 3.95 m, close to the midpoint of the overall length, which points to a balanced load distribution over that single axle.
Class O3 requires compressed-air brakes, since the overrun brake is no longer permitted from this weight class upward. A single-axle trailer of this length suits long but not extremely heavy goods such as pipes, building components or agricultural produce, though the single axle calls for careful loading so the coupling load stays within the permitted range.
When buying used, the single axle is the main point to check: wheel bearings, brake drums or discs and the suspension should be examined for play and wear, since the entire load rests here without a second axle to share it. The frame along the long span between coupling and axle, and the air-brake lines, should also be checked.
Sources: SpecCodex-Register: Kennwerte des Modells Klaesi AFL 7.1
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