WHILE DRIVING ON A STRAIGHT, SMOOTH ROAD AT APPROXIMATELY 30 MPH, THE TRAILER AXLE SUDDENLY BROKE FREE, CAUSING THE TRAILER TO FLIP ONTO ITS SIDE. THE TRAILER APPEARS TO BE A TOTAL LOSS. THE TOWING VEHICLE WAS DAMAGED SLIGHTLY. AS FAR AS I CAN TELL, THE RIDE SIDE LEAF SPRING BROKE, CAUSING THE AXLE TO BREAK FREE. THE AXLE TUBE BENT AND BROKE COMPLETELY NEAR THE LEFT SIDE LEAF SPRING. THERE WAS NO INDICATION OF AN ISSUE PRIOR TO THIS. THE TRAILER WAS RIDING LEVEL AND NOT PULLING OR JERKING THE TOWING VEHICLE PRIOR TO THE SPONTANEOUS, CATASTROPHIC FAILURE.