EE ATTEMPTED TO LOAD A LARGE ROCK ON A ROCK TRUCK, HE GOT THE 992C REAR WHEELS OFF OF THE GROUND AND ATTEMPTED TO LOAD THE ROCK ON 103 773 ROCK TRUCK. HE COULD NOT CONTROL THE LOADING OF THE R OCK AND DROPPED ROCK WHICH STRUCK THE 103 773 ROCK TRUCK. WHEN HE DROPPED THE ROCK, THE REAR WHEELS CAME DOWN ON THE GROUND JARRING HIM AROUND IN THE CAB, DID NOT HAVE SEAT BELT ON AND DID NO