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In recent years, with the expansion of highway-networks, the demand for better stability and controllability for trucks is greatly increasing. Therefore, it is necessary to promote speedy development and improved design quality by the use of Computer Aided Engineering (CAE). However, unlike with passenger cars, analysis by simple numerical simulation with less than 10 degrees of freedom is difficult since the torsional characteristic of the chassis frame and large scale deformation of the leaf springs must be considered.