Cable trays are only the "container" for the wiring. They don't have any other "intelligent" properties. The cables themselves and conduits containing cables are more important, in my humble opinion. If I can ever see Revit smart enough to show me something useable like this: 3 phase, 3 wire, w/ground: 3 #12, 1 #12 GRD. - in a 3/4" Conduit up to and beyond 3 -500 Kcmil, 1-250 Kcmil GRD. in a 3 1/2" Conduit, then and only THEN I will be satisfied! But hey, I am a woman. Go figure 🙂