A damping system for an implement support system in which a bucket 10 is mounted on a pair of support arms (12) which are pivoted relative to a tractor by a pair of hydraulic lift cylinders (15) controlled by electrically actuated hydraulic valve means (16) in response to commands (22) from a vehicle operator and/or an electrical control unit (21). The damper system includes a pressure level control loop having a pressure sensing means (15a) for sensing the pressure in the lift cylinders (15) due to a load currently carried in the bucket (10), storing means (21) for storing this sensed lift cylinder pressure as a reference value, the pressure sensing means also monitoring the lift cylinder pressure as the load is transported, and control means (21) for actively adjusting the pressure in the lift cylinders using the electrically actuated hydraulic valve means (16) if said pressure varies outside a predetermined deadband (r,s) either side of the reference value (P) in order to return the lift cylinder pressure to within said deadband and to maintain the support arm carrying position (Q). There is also disclosed a particularly useful joystick (22) control arrangement and a visual display (32) of current bucket orientation etc.