A suspension system for a vehicle, the vehicle including a vehicle body and at least two forward and two rearward wheel assemblies, the suspension system including a hydraulic system, the hydraulic system including: at least one front left, at least one front right, at least one rear left and at least one rear right wheel ram respectively located between the wheel assemblies and the vehicle body, each wheel ram including at least a compression chamber (45, 46, 48, 47); the compression chamber of each wheel ram being in fluid communication with a respective compression conduit (61, 62, 64, 63) forming a front left fluid volume (45, 61), a front right fluid volume (46, 62), a rear left fluid volume (48, 64) and a rear right fluid volume (47, 63); the hydraulic system further including a first flow control means and a second flow control means; the front left and rear left fluid volumes being in fluid communication with the first flow control means, the first flow control means controlling the fluid communication between the front left and rear left fluid volumes; and the front right and rear right fluid volumes being in fluid communication with the second flow control means, the second flow control means controlling the fluid communication between the front right and rear right fluid volumes, such that roll motions of the vehicle are resisted by the hydraulic system and when fluid is permitted to flow through the first and second flow control means warp motions of the wheels relative to the vehicle body are permitted by the hydraulic system; and a compression chamber damper valve (53, 54, 56, 55) between the compression chamber of each wheel ram and the respective compression conduit; the suspension system being characterised by at least two of the wheel rams at one end of the vehicle further including a rebound chamber (49, 50, 52, 51), each rebound chamber being in fluid communication with the compression chamber of the laterally adjacent wheel ram (49, 12; 50, 11; 51, 14; 52, 13); and by each rebound chamber including a rebound chamber damper valve (57, 58, 60, 59) in direct fluid communication with the compression chamber damper valve of the compression chamber of a laterally adjacent wheel ram. at least one front left, at least one front right, at least one rear left and at least one rear right wheel ram respectively located between the wheel assemblies and the vehicle body, each wheel ram including at least a compression chamber (45, 46, 48, 47); the compression chamber of each wheel ram being in fluid communication with a respective compression conduit (61, 62, 64, 63) forming a front left fluid volume (45, 61), a front right fluid volume (46, 62), a rear left fluid volume (48, 64) and a rear right fluid volume (47, 63); the hydraulic system further including a first flow control means and a second flow control means; the front left and rear left fluid volumes being in fluid communication with the first flow control means, the first flow control means controlling the fluid communication between the front left and rear left fluid volumes; and the front right and rear right fluid volumes being in fluid communication with the second flow control means, the second flow control means controlling the fluid communication between the front right and rear right fluid volumes, such that roll motions of the vehicle are resisted by the hydraulic system and when fluid is permitted to flow through the first and second flow control means warp motions of the wheels relative to the vehicle body are permitted by the hydraulic system; and a compression chamber damper valve (53, 54, 56, 55) between the compression chamber of each wheel ram and the respective compression conduit; the suspension system being characterised by at least two of the wheel rams at one end of the vehicle further including a rebound chamber (49, 50, 52, 51), each rebound chamber being in fluid communication with the compression chamber of the laterally adjacent wheel ram (49, 12; 50, 11; 51, 14; 52, 13); and by each rebound chamber including a rebound chamber damper valve (57, 58, 60, 59) in direct fluid communication with the compression chamber damper valve of the compression chamber of a laterally adjacent wheel ram.