I have a dead bar on my frame but I use an Innova and their frames are set up with one and designed to be highly versatile and geared to customization. they are like an erector set.
I just downloaded the assembly instructions for the Pinnacle frame and I don't see any way to attach a dead bar but it is very difficult to tell from schematic drawings. I would highly recommend contacting the Grace company directly to see if this option is even feasible for this frame. Not all quilting frames can accommodate a dead bar.