B Xl 4-NRJ-25-40-2S2W

The register lists 6 versions with kerb weights from 8,600 to 12,300 kg, gross weights from 36,000 to 61,000 kg, lengths from 10,720 to 13,250 mm and widths from 2,530 to 2,570 mm. The range spans from heavy two-axle to multi-axle semi-trailers near the upper limit of road haulage.

With gross weights from 36,000 to 61,000 kg, the range spans from the lower limit of EU trailer category O4 to close to what is possible on public roads at all without an abnormal-load permit; above 40 tonnes, most countries require an exceptional permit. Semi-trailers of this size carry air brakes throughout and need a tractor unit with licence category CE as the tow vehicle. The wheel count of 8 to 16 also shows how sharply axle-load distribution differs between the lighter and the heaviest-built versions of the range, and on road-haulage duty the frame and cross-members deserve regular attention for fatigue cracking.

Semi-trailers of this size carry building materials, bulk goods or machinery and are mainly used by hauliers in heavy haulage. Gross weights up to 61 tonnes sit at the upper end of what is possible on public roads without an abnormal-load permit.

When buying used, check the condition of the chassis and axle units, the brakes, tyres and suspension, and the registration documents, since weights above 40 tonnes usually require special permits. Parts for axles, brakes and suspension are available through the general commercial-vehicle trade.