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A new model of 4 × 2 semi-trailer tractor was introduced to the Japanese truck market from HINO MOTORS last year, which has improved riding comfort and remarkable features for trailer connecting/disconnecting operations. This new model has two typical methods of comfortable ride, those are full-floating cab mount system and air ride suspension for the rear axle. Since the analysis of tractor vibrations and the vehicle height control system of this model have given satisfactory results, and their outline is described here.