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Grdane Trail 7331 TRA 42 – EU category O4 trailer: 27,000 kg gross weight, 7,860 kg unladen weight, 12,900 mm length, 8,800 mm wheelbase
With a gross weight of 27,000 kg, the 7331 TRA 42 falls into EU trailer category O4, the group of heavy trailers above 10 tonnes.
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Unladen weight is 7,860 kg, giving a payload of 19,140 kg – a good seven-tenths of the gross weight. Length stands at 12,900 mm, width at 2,600 mm and wheelbase at 8,800 mm; the axle group sits far back on a very long body.
Air brakes are required in this weight class; a mechanical overrun brake is no longer permitted above roughly 3.5 tonnes gross weight. The far-back wheelbase points to a trailer for long, bulky goods such as pipes, sections or construction machinery, where the load area stays free of axles over a large part of the vehicle's length. The tow vehicle would be a lorry or tractor unit requiring category CE.
On a used example, what counts is the condition of the brake system and linings, the tightness of the air lines, and rust at the frame, drawbar and axle mounts. With the wheelbase set this far back, it is also worth checking the frame for distortion in the front, unsupported section, which is exposed to greater bending stress under uneven loading. The pins and bushings where the drawbar attaches to the frame are also worth checking for wear, since they carry the full towing load at the far end of a long lever arm over the years. A recent inspection report is useful too.
Sources: SpecCodex-Register: Kennwerte des Modells Grdane Trail 7331 TRA 42
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