I went into the house to wake my napping husband and he and my dad came out to inspect the damage. It was apparent that the window had blown outward and nothing had hit it.
After I took several pictures for documentation, hubby broke the rest of the glass out and we taped plastic over the window and drove home.
We took the truck back to the dealer and left it. The next day hubby called and was told that they couldn't figure out what had happened so basically they were doing nothing. Later in the day they heard from another dealer that this wasn't the first time this had happened and they finally replaced the window under warranty. There is no recall on this glass. Luckily my granddaughter was not in the back seat of the truck when the glass broke. I just hope no one gets hurt when this happens to someone else.