A suspension system for a vehicle having at least one pair of forward and one pair of rearward wheels, including: a suspension arm (7–10) for each wheel providing at least partial location of the associated wheel, the suspension arm (7–8) of the forward wheel being pivotally mounted to a vehicle body at a pivot position (11, 15, 12, 16) rearward to an axle line of the forward wheel, the suspension arm (9–10) of the rearward wheel being pivotally mounted to the vehicle body at a pivot position (13, 17; 14, 18) forward to an axle line of the rearward wheel; at least one lever arm (19–22) moving in conjunction with and extending radially from the pivot position (11–18) of each suspension arm (7–10); wherein at each respective side of the vehicle, a ram assembly (23, 24) is located between the lever arms (19–22) of the forward and rearward wheel, the ram assembly (23, 24) including at least a first (25, 27) and second (26, 28) variable volume fluid chamber, each fluid chamber (25–28) being in fluid communication with a fluid chamber (25–28) of an opposing ram assembly (23, 24) provided on the opposing side of the vehicle, such that there is fluid flow between the chambers (25–28) of the ram assemblies (23, 24) during heave motion of the vehicle, there is little to no fluid flow between the chambers (25–28) of the ram assemblies (23, 24) during roll motions, and there is an at least substantially longitudinal motion of the ram assemblies (23, 24) with little to no flow of fluid between the chambers (25–28) or the ram assemblies (23, 24) during cross axle articulations motion of the wheels.