That's terrible. He must have either a very low trailer or got her with the tires. Poor woman. And poor guy. The guilt must be awful.

Even professional drivers have awful accident sometimes. A few years ago there was an incident on the news. A trucker had been backing a trailer to unhitch it and killed his son by pinning him between the trailer and another object. People tend to forget that if you can't see their mirrors, drivers definately cannot see you.