Ifor Williams Trailer Crane - Bailey Forestry Engineering. Hiab 033T Crane to fit onto an Ifor Williams trailer. We manufactured our own extendable, retractable jacking legs and have installed a Honda engine as the cranes independent hydraulic power source. The lifting capacity of the crane is 2310kg@1500 and 520kg@6000. The overall weight of the fabricated item and the crane is 520kg, with the gross train weight of the trailer being 3500kg, thus leaving a good margin of payload.