How about this?

I like what some of you guys have for suggestions. Based on that I came up with this:



It is a 2x4 bolted to the apex of the truss, with a 3/8 all-thread passing through it and hanging all the way to below the ceiling. It's about 7' long. Alternate from side-to-side with the mounting on the rail. A 2' piece of mild steel strap from the beam angled up the ceiling about every 8' for lateral support. Now that I look at the drawing, I probably wouldn't have a separate hole and bolt for the lateral support, I'd just put it on the same side with the all-thread and use a second nut to pinch it down on the beam. That will serve a second purpose of keeping the beam from "climbing" the all-thread for any reason.

Any input?

-Scouder