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Tbz TBZ: an EU class O3 trailer from 2012 with a 4,638 kg gross weight, a 6.60 m length, a 2.20 m width, just above the O2 threshold
The TBZ from Tbz is a trailer built in 2012. With a gross weight of 4,638 kg it sits just above the 3.5-tonne threshold and falls into EU trailer class O3, the trailers between 3.5 and 10 tonnes. At 6.60 metres long and 2.20 metres wide, the TBZ is a mid-sized example of this class. This puts the TBZ just inside the next weight class up, with all the technical consequences that has for the brake system.
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An unladen weight of 1,460 kg leaves a payload of 3,178 kg against the 4,638 kg gross weight, a good two-thirds of the gross weight. Such a comparatively light chassis with this payload suits bulky goods rather than concentrated heavy loads. This puts the TBZ toward the lighter end of trailers that need air brakes rather than the simpler overrun system used on lighter O2 trailers.
Trailers just above the 3.5-tonne threshold normally carry air brakes from class O3 upward instead of the overrun brakes typical of O2, and need a towing vehicle rated for a higher trailer weight than lighter trailers require. They are used in commercial transport of building materials, equipment or vehicles.
On a trailer just above the O2 threshold, check first whether the brake system is genuinely air-operated rather than an overrun type. Also check the brake lines for leaks, the condition of the load bed for wear, and look for rust on the chassis rails. Also check the drawbar and its bearing, which tend to see more stress on trailers sitting close to a class boundary.
Sources: SpecCodex-Register: Kennwerte des Modells Tbz TBZ
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