The classic ride model CR48 air-cushioned suspension for fifth-wheels was studied to determine its effects on fuel consumption saving, motion-induced vibrations, and load sway (trailer roll) when used on logging trucks in their actual working environment. Comparison of trips made by a tractor-trailer, on various road surfaces, both loaded and empty, with the air cushion inflated and deflated, shows overall improvements of 1 to 2% in the fuel consumption rate when inflated. Some positive effects on vibration levels were found on the tractor and trailer when loaded. Little improvement was found when empty. No detrimental effect on load sway was observed.