A LOW SPEED REAR-END COLLISION RESULTED IN AN IMMEDIATE EXPLOSION OF THE VEHICLE, CAUSING A LARGE EXTERNAL FIRE AND SMOKE TO ENTER THE CABIN UPON IMPACT. THE STRUCTURAL DAMAGE TO THE VEHICLE OCCURRED ON THE FRONT-RIGHT; THE FIRE DESTROYED THE ENTIRE FRONT 2/3 OF THE VEHICLE (TOTALING THE VEHICLE). THE CONCERN IS THAT SUCH A LOW SPEED IMPACT SHOULD NOT CAUSE AN EXPLOSION WHICH COULD POTENTIALLY HAVE INJURED OR KILLED THE DRIVER AND PASSENGERS.