Delayed installing my roof racks out of fear of cracking the glass. Buy beat torque wrench you can buy. Take extra care, and way too long lining everything up to make sure everything is perfect. Tighten bolts in cross cross pattern slowly to make sure all sides are tightening at the same time. Inch the torque wrench to 2NM on each nut. And go through again with the wrench set to 2.8 just to line up the bolts so they can lock, and my rear passenger glass cracks at just past 2NM.
more frustrating than the looming incoming bill, is the care and attention and research I did to make sure I was doing it right. I work with tools regularly, I’m technically inclined. This shouldn't happen. If it’s this fragile then it should be installed at the shop.