A system (100') for filling a holding tank (300) with agricultural product (390) is disclosed; comprising: a holding tank and a supply line (310) operable to receive a flowing agricultural product blown by a conveyance device (121, 123); a plurality of outlets (312) open to a holding space (302) of the holding tank and comprising a first outlet (312a) and a second outlet (312d); and a plurality of junctions, each junction (316a, 316b) associated with a corresponding outlet (312a, 312b) of the plurality of outlets, the plurality of junctions comprising a first junction (316a) associated with the first outlet, and a second junction (316') associated with the second outlet; wherein the first junction (316a) is configured to direct agricultural product to flow out of the first outlet until the first outlet becomes blocked, and to thereafter direct agricultural product to flow toward the second junction which is configured to direct agricultural product to flow out of the second outlet. Furthermore, a mobile agricultural equipment (100) comprising the system (100') and a method of filling a holding tank is disclosed.