Abstract: A vehicle having a body 25 supported respective pairs of front and rear wheels, 30, 31, 32, 33, two piston and cylinder units, 23-24, 35-36, 37-38, 34-39, being associated with each wheel and connected between the wheel 30 and body 25 so the piston moves in the cylinders in response to relative movement between the wheel and the body. An individual fluid circuit 40, 41, 42, 43, connecting one piston and cylinder unit 23 of each wheel 30 to a corresponding unit 34 longitudinally spaced therefrom on the same side of the vehicle, and the other piston and cylinder unit 24 of each wheel to a corresponding unit 35 on the transversely opposite side of the vehicle.