A rear defrost system malfunctioned and was smoking in the interior of the vehicle followed by the rear glass shattering. The electrical malfunction could have easily started a fire and glass flying around the cab a highway speeds could definitely be hazard. I called the dealership and they were unconcerned and gave me a quote to replace it. the dealer or the aftermarket glass replacement company have not heard of it happening. I did find a recall in Canada. Strangely enough mine was done in Canada and it happened again.