a trailer - mounted crane apparatus includes a trailer supported from a ground surface on at least two wheels . a hydraulically operated crane arm is mounted to the trailer and is extendable outwardly . a crane hydraulic power unit is mounted to the trailer and supplies pressurized hydraulic fluid to the crane arm . a vibrational sheet piling driver can be supported by the crane arm . a vibrational hydraulic power unit for supplying power to the driver is mounted on the trailer . a control panel for the crane hydraulic power unit and the vibrational driver hydraulic power unit , and an associated operator &# 39 ; s seat , are also mounted on the trailer . the crane apparatus includes wide tires for reducing the surface pressure under the apparatus . this allows the apparatus to be transported across and used on delicate surfaces such as golf course greens and other groomed surfaces .