Tractor units

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Match a tractor unit to the semi-trailer, combination weight, route and driver duty. Fifth-wheel height and coupling geometry must fit before fuel use or cab equipment can be compared.

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How should Tractor units listings be compared?

A tractor unit has no cargo body and forms a combination with a semi-trailer. Chassis, axles, coupling and connections therefore need to be assessed for the specific trailer and expected loading.

What actually changes the choice?

Define gross combination weight, fifth-wheel load and height, sweep clearance and required air and electrical connections. Gradients, yards and route type influence the choice of 4x2, 6x2 or another layout, wheelbase, lifting axle, final drive and tank capacity.

Compare engine output together with torque, gearbox, retarder and route profile. Long-haul work values cab space, parking climate and storage, while distribution prioritises manoeuvrability and access. Check whether optional equipment mass reduces the payload of the combination.

How should a used vehicle be checked?

During the road test assess cold start, shifting, engine brake or retarder, tracking, vibration and emissions-system warnings. Inspect frame, fifth wheel and locks, trailer connections, suspension, axles, tyres and leaks. Reconcile mileage with tachograph, control units and service invoices.

What information should the seller provide?

Ask for VIN, axle configuration, wheelbase, fifth-wheel height and make, unladen weight, rated combination weight and software or service history. Provide the intended trailer, route and load so that coupling, connections and axle loads can be confirmed.

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