I think I kinda did something cool with mine to verify that it didn't bend (though I can understand Eddie's point... people underestimate the stresses you can
introduce by welding onto structures):
I welded up an alignment jig. Not one attached to the axle. Just a frame with precisely ground pins that were installed to make contact with specific points on the axle. I welded the pins in place before I installed the truss, and then, using feeler gauges and a micrometer, I could measure how much the axle was moving towards or away from the pins after welding pieces of the truss. I think it was a pretty cool idea. I did it in 3 planes (X, Y, Z) so I could monitor bending in all axes. I had no more than a 0.002" change in any measurement before and after truss install. Also, by rechecking your ring and pinion tolerances before and after the welding and verifying no change, you can fairly confidently know that the diff case didn't distort either. Oh, and BTW, I took measurements at the same shop temperature before and after, to minimize temp changing the jig's and axle's expansion
The key was slow, alternating welding. Maybe mine was so solid because I sleeved the tubes with the Evo Magnum sleeves first... either way, I think it can be done well. And I've seen 2 bent control arm mounts on non-trussed axles on that passenger side upper, so the truss is nice to address things like that. IMO