The Transtacker is a heavy-duty, AC/DC-powered truck that combines high-density unit load handling with operator up orderpicking. It has a capacity of up to 4,000 lbs., an elevated height of 59 feet, and the ability to operate in aisles as narrow as 54 inches. The Transtacker operates on AC power and is guided by floor and ceiling mounted guide racks while in the aisle. Outside the storage aisle, the Transtacker operates as a DC battery powered vehicle, providing fast and easy aisle changing capabilities with no mechanical aisle changing devices. The DC battery is recharged when the Transtacker is operating in the aisle.