To further the industry's understanding of the relationship between off-road travel and machine operator well-being, FERIC evaluated the motion induced vibration levels generated by wheeled skidders working in a variety of operating conditions. Ride-induced vibration was measured for a sample of grapple and cable skidders, both with and without suspension seats, during actual operations in Ontario and Quebec. The whole-body vibration (WBV) recorded was analysed in terms of RMS, peak, and crest factor levels. The operator's daily vibration exposure was found to equal or exceed the "acceptable" limits as defined by the ISO 2631 standard in all cases. In addition, the report presents a discussion of WBV theory and issues of potential interest.