Abstract: The device comprises a derrick with a main telescopic arm and an auxiliary arm. The telescopic arm 9 is pivoted on a sub-frame which in turn is pivoted to the main chassis of the vehicle. At the front the main vehicle chassis 3 is mounted a cam having ramps 20 and 21 on which travels a roller mounted to the free end of the telescopic arm. In order to tip the load on the vehicle, the telescopic arm is first contracted, providing a slight upward swing of the arm when the roller 22 climbs the ramp 20. This appreciably relieves the load requirements of the tilting jack thereby enabling handling of larger loads.