I think what you're describing is a MAJOR problem with truss and gear. The center connection is insane and has NOTHING to do with real life. With Vectorworks Truss object, I can add hanging positions inside or coincident to the chords. Then I can add lights, speakers, whatever to those poisiiktns. So the clamp on a device would find the connection, but it won't be connected to the truss and will not be calculated in Braceworks. There is no reasonable way that I know of to use any or all of the cords of a truss to hang gear in Braceworks.
So, I imagine that's where your clamps are going; to the mystery Braceworks space.