Ackermann Frueh AF-3-10Z

Unladen weight stands at 4,450 kg, length at 8,650 mm and width at 2,500 mm. The difference between gross and unladen weight gives a payload of 11,050 kg, more than double the unladen weight – a ratio pointing to a trailer built around payload rather than a light structure, of the kind used for bulk goods, building materials or machinery.

Trailers of this weight class are fitted with air brakes, since overrun brakes are not permitted above roughly 3.5 tonnes. The tow vehicle would be a lorry requiring licence category C1E or CE, depending on its own gross weight.

On a trailer built in 1985, what counts above all is rust at the frame, axles and drawbar, the condition of the air brake system including its lines and brake cylinders, and the function of the lighting and electrical plug. Given such a high payload share, it is also worth checking whether the frame and deck show signs of past overloading or wear from bulk cargo, and whether the brake cylinders and slack adjusters have been serviced recently enough to still meet current inspection limits. Given its common use for bulk goods, it is also worth checking the side boards for rusting through from the inside, which is often not visible from outside.