I think others have pretty much answered your questions. I am curious to know what type of tire it was - make, and type, (i.e ST or trailer tire, or LT, light truck tire.) Many of us have switched to LT tires because of problems with trailer tires - as you will be able to read on this forum.
Also, wonder if you are in the habit of regularly checking tire pressures - they say under inflated tires are one of the largest causes of blow outs.
It is certainly no 100% guarantee, but I believe that a Tire Pressure Monitoring System, (TPMS) is a good investment against possibly having a repeat of this potentially costly situation. It will warn you of slow leaks that if not noticed, could lead to a shredded tire, and in the event of a sudden blowout - which you may not realize you have had for a while, should give you a warning quickly and with luck, allow you to pull over before major damage is caused.
Certainly good practice to take a walk around every time you stop for fuel or a rest stop and visually examine all tires.
Don't mean to preach, and my apologies if you are already very well aware of this!
Brian & Connie Mitchell
2005 Classic 30'
Hensley Arrow / Centramatics
2008 GMC Sierra SLT 2500HD,4x4,Crew Cab, Diesel, Leer cap.