Hey Ken, To be honest I know nothing of certified grading other than looking for defects and their proportions (knots). I can say that we did visually inspect the pieces.
The other day a couple of us were looking at them discussing whether the half lap cross bracing is in fact doing anything to resist any forces that might want the legs to spread. Since the top of the bracing has a tenon (no pegs) and bolted to those bottom chords are they really doing anything? Is it possible that the half lap combined with the opposing noses of the tenons can keep it from spreading?
I do not know how to load test the sawhorses, but would like to learn. I do assume you are talking of a safer way than "yea that was too much timber".
