A combination of an agricultural combine, a self-propelled tractor and a grain cart, wherein: the combine comprises a central chassis, a grain tank, an unloading auger with an outer end for delivering grain from the grain tank to a receptacle, and a laterally elongated harvesting mechanism; the tractor has a prime mover and is capable of operator-controlled ground movement and supplying extra power, the grain cart comprises said grain receptacle and a plurality of wheels connected to said grain cart, at least one of said wheels (26, 28) being steerable and at least one of said wheels (30,32) being powered for ground movement of said grain cart in a given direction; an elongated connector is operatively connected at one end thereof to said at least one steerable wheel (26, 28) and at least one powered wheel (26, 28, 30, 32), said connector being deployable laterally relative to the said given direction of ground movement for said grain cart; a device primarily powered by a PTO of the tractor is connected to an opposite end of said elongated connector for supplying ground movement and steering inputs to said at least one wheel; and the tractor contains an operator control input so that the operator of the tractor can control, from a station significantly outboard of the lateral extent of the harvesting mechanism, the speed and steering capability of the grain cart to cause it to closely follow the central chassis of the combine laterally offset with respect to the tractor for receiving grain from the unloading auger; characterized in that the outer end of the unloading auger is located within the lateral extend of the harvesting mechanism; the combine comprises a central chassis, a grain tank, an unloading auger with an outer end for delivering grain from the grain tank to a receptacle, and a laterally elongated harvesting mechanism; the tractor has a prime mover and is capable of operator-controlled ground movement and supplying extra power, the grain cart comprises said grain receptacle and a plurality of wheels connected to said grain cart, at least one of said wheels (26, 28) being steerable and at least one of said wheels (30,32) being powered for ground movement of said grain cart in a given direction; an elongated connector is operatively connected at one end thereof to said at least one steerable wheel (26, 28) and at least one powered wheel (26, 28, 30, 32), said connector being deployable laterally relative to the said given direction of ground movement for said grain cart; a device primarily powered by a PTO of the tractor is connected to an opposite end of said elongated connector for supplying ground movement and steering inputs to said at least one wheel; and the tractor contains an operator control input so that the operator of the tractor can control, from a station significantly outboard of the lateral extent of the harvesting mechanism, the speed and steering capability of the grain cart to cause it to closely follow the central chassis of the combine laterally offset with respect to the tractor for receiving grain from the unloading auger; characterized in that the outer end of the unloading auger is located within the lateral extend of the harvesting mechanism;