WHENEVER BRAKING OR ACCELERATING DRIVER'S SEAT WOULD MOVE BACK & FORTH ON THE TRACKS. SEAT WAS VERY UNSTABLE. COULD ADJUST SEAT & LOCK IT. STAYED IN PLACE UNTIL THE BRAKING OR ACCELERATING. CONTACTED DEALERSHIP 7 TIMES IN 3 YEARS. HAD NUTS & BOLTS TIGHTEN & ADJUSTED. PROBLEM STILL EXISTS ON THE SEAT. MANUFACTURER WHO NO HELP SOLVING PROBLEM. *AK