How sturdy are the grim locks? How much weight would you hang from them?I girth hitch my lineman rope and tuck it into my sys on the left side, and then keep my tether in the right. The one on the right is the ES, so it holds a DIY back band and pull up rope as well. I also attached a few grimloc carabiners around the backside of my saddle, they are very handy for hooking random things like your pull up rope, or a couple climbing sticks.