Application or a hydropneumaiic boom support system with controlled stiffness and dissipation parameters in a crane in its ready-for-transport position allows for modification of dynamic properties or the crane and for vibration mode control during the ride. Adjusting the support system llexibility to disturbances being the result of uneven terrain may heir to reduce the loading of the bearing structure and to increase speed still maintaining the required safety and comfort standards. That improves the functional quality of mobile machines. The results of this study may be used as the basis for evaluation 01· vibration control methods in mobile cranes in which the boom acts as a dynamic absorber.