One thing to think about on a blowout... the tire may come apart enough to where a loose flap of blown away tire may catch on the body, suspension bolts, etc and stop the tire from turning. so not only are you dealing with the loss of stability from the blown tire, but having essentially one of three wheels locked up at high speed and throwing you into a sideways skid..

I read about this on some of the Explorer roll overs that mentioned the blown tire or the long flap of thrown thread on the Firestones wrapping around an axle or catching on the body making it almost impossible to control at high speed.. and once the rear end comes around, it's pretty much a guaranteed roll over..

After talking to my tire dealer I don't even use tire plugs for nail punctures any more.. The concern is if the tire is not patched on the inside, air may get between the layers of the tire and start to delaminate it...