This is the front window in the trailer -- it is always protected by the rock guard when we are in motion. If this had been the windshield of the truck, it would have been covered by insurance.
I suspect thermal shock was involved. I did not put any water on the window, but the trailer was parked all day in 105 degree heat with the air conditioning on full blast inside. We had to leave the trailer at an RV park all day for a family party, and we left the A/C on in order to keep our ice chest as cool as possible. The little crack appeared the next morning. The window never shattered, despite 1600 miles of rough Calif. freeways.
Judging by the answers so far, is there some other kind of glass (other than auto glass) that would do the job? I do not want to put in glass that is too thick -- it might not fit well into the frame and might cause a leak.
