Carrier/rack problems of the 2005 GMC Envoy

We parked our GMC Envoy in the driveway the evening of 6/8/13 around 7:30 pm. I hadn't used the rear hatch at all on this day. My husband was outside and left and came back in his vehicle after midnight. So sometime in the early hours of 6/9/13 the rear window exploded. At first we though something or someone broke it, however there were no foreign objects found that could have caused it the break. It wasn't a nick or crack, the glass was completely shattered. Most of the glass was on the outside of the vehicle and all over the side walk with only a small amount on the inside of the vehicle. The vehicle was locked from the inside. After doing an internet search I found many other instances of the exact same thing happening to other GMC Envoys. In some cases people were near enough and some being inside the vehicle and incurred injuries with no known or apparent cause for the glass to be shattered. Thank goodness we were inside sleeping and there were no injuries. The problem comes in that I cannot afford to have it fixed even with my insurance as my deductible hasn't been met, so we have plastic over it. With all the reports of this happening to other people GMC claims to have never heard of such a thing. I'm going to take it in to a dealership this morning, but wonder if anything can be done to compensate replacing the glass.