actuator in some embodiments the frame 15 is adapted to be lifted by a lifting element of a vehicle such as a tractor or a skid steer loader not shown for example in the embodiment illustrated the frame 15 is constructed of a lower cross member 31 an upper cross member 33 a first vertical member 35 and a second vertical member 37 the four members defining a generally rectangular shape a first engagement member 39 is attached to the first vertical member 35 and a second engagement member 41 is attached to the second vertical member 37 the lifting element of the vehicle engages the two engagement members to lift the frame 15 or the vehicle may be connected to the frame in some other manner in some embodiments the first gripper 17 is slidingly mounted to the frame 15 this may be done by attaching the sleeve 27 to a sliding unit 45 that slides along the lower cross member 31 in the embodiment shown the second gripper 19 is fixedly attached to the frame 15 through a mount 47 in other embodiments the second gripper is slidingly mounted to the frame 15 for example by means of a sliding unit similar to the sliding unit 45 in such embodiments the actuator 21 may be.