DRIVER'S SEAT BACK COMPLETELY COLLAPSED DURING A REAR END COLLISION. DEALER/ MANUFACTURER WERE NOTIFIED. *AK CONSUMER STATES THAT REAR INTIAL IMPACT WAS FROM A PICK UP TRUCK TRAVELING APPROXIMATELY 45 MPH, DRIVER SUSTAINED NECK AND BACK INJURIES AS WELL AS BRUISED SHINS FROM IMPACT WITH UNDERSIDE OF DASH. *TT