I have a 2008 era PRS Standard 4x8. This was the one that came with only 4 legs, not the 6 that you see on them now. I was checking my bot for square and level and I put a 6' Stabila level on my X axis extrusion. It's sagging in them middle on both sides.
It definitely needs some support in the middle. Has anyone ever bought, or had made a set of addon legs to go in the middle? They don't seem that hard to fabricate by a metal shop...