TL*THE CONTACT OWNS A 2006 CHEVROLET AVALANCHE 1500. THE CONTACT STATED THAT WHILE DRIVING AT APPROXIMATELY 55 MPH, THERE WAS SMOKE COMING FROM THE VEHICLE AND IT SUDDENLY CAUGHT ON FIRE WITHOUT WARNING. THE FIRE DEPARTMENT EXTINGUISHED THE FIRE. THE CONTACT DID NOT DISCLOSE IF A POLICE/FIRE REPORT WAS FILED OR NOT. THE VEHICLE WAS TOWED TO AN INDEPENDENT MECHANIC WHERE IT WAS DEEMED DESTROYED. THE MANUFACTURER WAS NOT MADE AWARE OF THE FAILURE. THE APPROXIMATE FAILURE MILEAGE WAS 147,000.