An agricultural harvester comprising: a support frame; a hopper coupled to said support frame, said hopper being configured to store an agricultural product during a harvesting operation; and an unloading system comprising a transfer conveyance having an inlet end and a discharge end, the unloading system configured to transport agricultural product received from said hopper to an off-machine location; characterized in that said unloading system comprises: a metering gate positioned for communication with a bottom of the hopper, said inlet end of said transfer conveyance in communication with said metering gate; at least one sensor providing an output signal representing an operating parameter associated with an unload rate of agricultural product through said transfer conveyance during an unloading operation; an electrical processing circuit coupled to an actuator of said metering gate and said at least one sensor, said electrical processing circuit controlling a position of said metering gate dependent upon said output signal by means of said actuator; said operating parameter associated with said at least one sensor corresponds to at least one of: a terrain over which the agricultural harvester traverses, a fluid pressure of a lift cylinder associated with the transfer conveyance and a position of a telescopic second stage transfer assembly of said transfer conveyance. a support frame; a hopper coupled to said support frame, said hopper being configured to store an agricultural product during a harvesting operation; and an unloading system comprising a transfer conveyance having an inlet end and a discharge end, the unloading system configured to transport agricultural product received from said hopper to an off-machine location; characterized in that said unloading system comprises: a metering gate positioned for communication with a bottom of the hopper, said inlet end of said transfer conveyance in communication with said metering gate; at least one sensor providing an output signal representing an operating parameter associated with an unload rate of agricultural product through said transfer conveyance during an unloading operation; an electrical processing circuit coupled to an actuator of said metering gate and said at least one sensor, said electrical processing circuit controlling a position of said metering gate dependent upon said output signal by means of said actuator; said operating parameter associated with said at least one sensor corresponds to at least one of: a terrain over which the agricultural harvester traverses, a fluid pressure of a lift cylinder associated with the transfer conveyance and a position of a telescopic second stage transfer assembly of said transfer conveyance. a metering gate positioned for communication with a bottom of the hopper, said inlet end of said transfer conveyance in communication with said metering gate; at least one sensor providing an output signal representing an operating parameter associated with an unload rate of agricultural product through said transfer conveyance during an unloading operation; an electrical processing circuit coupled to an actuator of said metering gate and said at least one sensor, said electrical processing circuit controlling a position of said metering gate dependent upon said output signal by means of said actuator; said operating parameter associated with said at least one sensor corresponds to at least one of: a terrain over which the agricultural harvester traverses, a fluid pressure of a lift cylinder associated with the transfer conveyance and a position of a telescopic second stage transfer assembly of said transfer conveyance. a terrain over which the agricultural harvester traverses, a fluid pressure of a lift cylinder associated with the transfer conveyance and a position of a telescopic second stage transfer assembly of said transfer conveyance.