Tipping trailer

A tipping trailer comprising a hopper having a base, side, front and rear walls, a pair of trailer wheels mounted to said base arranged to support the hopper from a ground surface during towing, a frame comprising a pair of substantially parallel side arms each being pivotably connected to the sides of the hopper at a point above the trailer wheels and a forward portion connecting the side arms and having a trailer coupling fixed at or near the leading end thereof by which the trailer can be connected to a towing vehicle, and locking means arranged to secure the hopper with respect to the frame during towing, wherein the side walls of the hopper are a matching pair, each having a first curved edge portion extending from the base forming a pair of skids for the hopper, the arrangement being such that upon release of the locking means the hopper and the trailer wheels may tilt about the pivotal connections between the side arms and the sides of the hopper such that an edge of the skids adjacent the base makes contact with the surface below and on reversal of the trailer the hopper and wheels revolve, the hopper rolls back on the curved skids, and the wheels pass upwards between the side arms whereby the hopper is upended.