Adjustable Spans: up to 20’ on 1-ton models and 15′ on 2- & 3-ton models Starting as light as 116 pounds, Spanco Aluminum Gantry Cranes are lightweight, portable, and extremely stable under load. These All Aluminum Spanco Gantries quickly assemble and disassemble, making them popular with contractors who need highly mobile lift equipment that they can carry in their service trucks.