During exploitation, commercial motor vehicles are exposed to vibrational loads that lead to fatigue of the users and materials of their components. Therefore, they need to be studied in the earliest design phase, using mathematical models, experiments, or their combinations. In theoretical considerations, vibrations of concentrated masses are usually observed, although recently, with the development of numerical methods (especially finite element methods), attention is also paid to the vibrations of elastic systems of these vehicles. In such cases, simplifications are usually made, especially regarding exploitation conditions and the interrelationships of vehicle components. This paper attempts to develop a method for identifying vibrational loads on the steering rod under exploitation conditions, using a two-parameter frequency analysis with the use of 2D Fourier transform. The applicability of the procedure is illustrated on an idealized model of the steering rod, and the conducted research has shown that the two-parameter frequency analysis can also be used to generate transverse vibrations of the steering rod in laboratory conditions.