Levelling apparatus for load supporting platform for vehicle

A levelling apparatus for maintaining the orientation of a moveable load supporting platform 30 in a vehicle is disclosed. The apparatus comprises a rack and pinion mechanism comprising a pair of respective first pinion gears (76) mounted to a common axle mounted (78) to one of the platform or the vehicle, and a pair of spaced apart rack gears (72) having respective first rack gear surfaces (74) and mounted to the other of the platform or the vehicle and adapted to engage respective first pinion gears such that rotation of the axle produces substantially equal displacement of both of the rack gears of the pair relative to the axle. A gear train (80) retains the first pinion gears in engagement with the corresponding first rack gear surfaces.