A tire unloader includes a mobile support structure, a robotic device supported by the mobile support structure, and a drive system. The drive system maneuvers the robotic device. The robotic device includes an engagement mechanism. The mobile support structure positions the robotic device to allow for engagement, lifting, and unloading stacks of tires. A remote user optionally controls the movement of the mobile support structure and the operational actions of the robotic device. A material conveyer optionally receives the unloaded material. A second robotic device located near the second end of the material conveyer optionally engages the unloaded tires on the conveyer and transfers the unloaded tires onto the transporting cart, which transports the unloaded material to a predetermined location.