The bulk materials cart has a dual unload system including at least two inclined belt conveyors bounding an enclosed cavity. A first belt conveyor is operable for conveying bulk materials from the cavity to an unloading conveyor extendable from that side of the cart. A second belt conveyor is operable for conveying bulk materials upwardly and over another side of the cart. The dual unload system is automatically operable in a first mode operating the first belt conveyor and the unloading conveyor for conveying the bulk materials away from the cart, and in a second mode operating the second belt conveyor for conveying the bulk materials over the side of the cart.