Ditto. Both of my QS8s are hung using drywall anchors. In fact, one wall of my HT is thin beadboard on studs over concrete - meaning the wall is about 1.4 inch thick.

I used drywall anchors and a product similar to a toggle bolt to hold the T-Bar to the wall. It's rock solid, nonetheless.

The QS8, while heavy, is well supported on the bracket, so long as the bracket has enough connection points to spread the sheering force over a large enough portion of the wall.