Bryce,
I would think for metal porcelain signs, you really shouldn't have a problem. My 48" Shell is the biggest, heaviest sign I have and I be it's only 50 pounds or so. So even if you hung six of those across the same truss, that's only 300 pounds. Plus, the ones near the walls won't put as much strain on the truss since some of that weight would be transferred to the poles I would think. Now, if you had some large neon signs, I would be careful not to put those on the same truss and would span them across to distribute the weight better.
I see you didn't take me up on my offer Bryce...
BrianH
