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In a vehicle combination consisting of a tractor unit and a semi-trailer, if the load is concentrated in the front part of the semi-trailer, it can:
By concentrating the load in the front part of the semi-trailer, an excessive transfer of weight occurs to the coupling plate of the tractor unit. This causes the rear axles of the semi-trailer to have less load, reducing the grip of its tires on the road surface and, consequently, compromising the braking effectiveness of the semi-trailer itself. On the other hand, the increase in weight on the rear axle of the tractor unit tends to increase the grip of its wheels, not directly compromising its braking effectiveness. Furthermore, the maximum authorized load capacity for the combination remains unchanged, so incorrect distribution affects safety and dynamic stability, but not the nominal load capacity of the combination.