Barrier 2 solution to satisfy requirements for additional protection against slide.
Screw the bracket on the top U-bolt from the centre support, with the bracket in the lowest position. Tighten the nylock nuts, then release ¼ turn. This is to ensure the bracket isn’t loaded, and to be able to see if the support has slidden. Attch the top U-bolt with the U-bolt plate between the rockbolt and the bracket. Tighten the nuts to the recommended torque based on the size.