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Strempol STR: a heavy EU class O4 trailer from 1995 with an 18,000 kg gross weight, a length of 12.40 m and eight wheels on a 6,900 mm wheelbase
The STR from Strempol is a trailer built in 1995. With a gross weight of 18,000 kg it sits well above the 10-tonne threshold and falls into EU trailer class O4, the heavy trailers and semi-trailers towed behind suitably rated tractor units in long-haul and heavy transport. At 12.40 metres long with eight wheels, the STR is a long, multi-axle example of this class.
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An unladen weight of 16,500 kg leaves only 1,500 kg of payload against the 18,000 kg gross weight. Such a heavy chassis paired with comparatively little payload is typical of trailers that themselves serve as a load-bearing structure for heavy, compact cargo. The 6,900 mm wheelbase spread across eight wheels underpins the 12.40 m length and the 2.59 m width.
Heavy O4 trailers of this build typically carry construction machinery, industrial plant or other compact heavy loads, where load-bearing deck area and a stable, low frame matter more than payload. Because the gross weight exceeds 10 tonnes, such trailers are normally fitted with air brakes and need a towing vehicle rated for a correspondingly high trailer weight.
When buying a trailer this old and heavy secondhand, the frame comes first: cracks and corrosion on the cross members and around the eight wheel mounts are the biggest concern after decades of heavy use. Also check the air brake system for leaks, the condition of the axle bearings and suspension, and look for old repair welds on the chassis.
Sources: SpecCodex-Register: Kennwerte des Modells Strempol STR
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