A vehicle with an active suspension system has a road wheel suspension unit comprising a double-acting hydraulic actuator (5) extending between a fitting (7;37) connected to the vehicle body or chassis and a pivoted road wheel suspension arm (2), a coiled compression spring (11) in parallel with and surrounding the actuator, a load cell (21;41) for signalling actuator loading, and a resilient isolator ring (25;47) in series between the load cell and the fitting, or the actuator and the load cell.
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