AFTER DRIVING ABOUT 30 MILES AND RETURNING HOME, THE TRUCK CAUGHT FIRE WHILE SITTING IN THE DRIVEWAY - ABOUT 20 MINUTES AFTER ENGINE WAS TURNED OFF. BY THE TIME SMOKE WAS SEEN, FLAMES WERE COMING FROM UNDER THE HOOD AND THE RIGHT FRONT TIRE WAS BURNING. THE FIRE DEPARTMENT PUT OUT THE FIRE BUT THE TRUCK WAS COMPLETELY DESTROYED. THE FLAMES SPREAD TO AN ADJACENT VEHICLE AND IT TOO WAS DESTROYED.