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Numerous specifications and tight time schedules in the development of special trucks require the application of comprehensive CAE-methods prior to the cross-country test phase. The methods applied to the development of a complete family of offroad-trucks are presented by the following subjects: stress, fatigue and dynamic analyses based on the finite element method calculation of the comfort by multibody systems mobility analysis system dimensioning, e.g. cooling and brake system prediction of the fuel consumption, gradability, acceleration and loading spectra by a computer driving simulation servo-hydraulic tests of vital parts and sybsystems, based on field data acquisition and processing