[jcurtis934]

The interesting thing with safety glass is that it takes impacts to the surface with ease as long as it isn't too hard. What it doesn't do well at all is a hit to the edge of the glass. Shatters very easy. Look at the joint all around the window frame where the glass should still be residing but isn't. And if you find anything strange in there...like screw installed wrong...or the window frame messed up...take a picture. But it could be that the fifth wheel, as it sits, had enough twist in the frame to stress the window frame and with the cold temperatures and a brisk closing of the door sent the window glass into the "final frontier". John