ABSTRACT A wheel suspension system for a chassis of vehicle includes at least two wheel assemblies. Each wheel assembly includes a trailing arm which is substantially aligned with forward motion direction of the vehicle, having a first and second ends, pivotally connected at the first end to the chassis of the vehicle and coupled to a wheel axis at a location adjacent the second end, and a shock absorber coupled to the chassis or an extension thereof, the shock absorber coupled to the wheel axis, for damping motion of the wheel axis due to shocks exerted by a rough surface on which the wheels travel.