EMPLOYEE WAS GETTING LOADED WHEN A SECTION OF THE HIGHWALL FELL STRIKING THE BED AND CAUSING THE CAB TO BE LIFTED INTO THE AIR. EE DID NOT GO TO THE DR. THAT NIGHT. THE EE CAME TO WORK ON 10/13/04 AT 6 PM. AFTER DRIVING THE TRUCK FOR AWHILE, EE COMPLAINED OF BACK PAIN & SORENESS.