I don't really think they are as dangerous as a lot of people think they are. I used to change them all the time, and I am not concerned about the ones I have mounted. But I don't want anyone changing them on my property. Times have changed. More value is placed on human life and limb than 50 years ago. Next month it will be 50 years that I have owned and operated semis. Back in 2011 I had the first and only wreck that put a driver in the hospital. He was on life support for 17 days. My workman's comp experience modifier went form .91 to 1.60 which is almost double and translated into premium, it means an extra $30,000 a year out of my pocket. It sounds like the guy knew what he was doing, but I just don't need any accidents around my shop. And even if someone stumbles in off the street and uses my tools, he is considered contract labor. I'm just too old to be playing with fire any more.