Regarding the question about which Tactical Tailor rig I was talking about above - the thing I'm talking about is the one-pc chest rig that has 3 rows of MOLLE webbing and shoulder straps that cross in back. Check out the Paraclete RACK and imagine it without a bib. That's what I have and I like it better than anything else I've tried, but it's essentially the same thing as the Tactical Tailor 1-pc MAV, only a lot more money.
Just so you know, I've tried the standard LC-2 gear, Blackhawk "enhanced LBV", Eagle SF-AK chest rig, Tactical Tailor Assault vest, SOE urban assault vest, Blackhawk and Eagle "Recon" and Rhodesian chest rigs, SO Tech Hellcat, and HSGI Wasatch, Weesatch, and both Woosatches ("A" and "E")... And by far the best thing I've found for carrying ammo, a canteen, and a trauma kit, WITH a ruck and WITHOUT armor is this cut down Paraclete RACK. Everything else I've tried has serious drawbacks that you don't even notice until you start wearing it and actually using it for hours at a time.
Simple minimalist approach that you can carry as much or as little as you want,
without having a set of padded shoulder straps under your ruck's shoulder straps eating holes in your shoulders.EDITED TO ADD PIC: You can see what I'm talking about in this photo. The chest rig or LBV's shoulder straps really start to dig if you have a ruck on over it. Best solution I've found is to have as little as possible between your body and the ruck - that seems to be the trick to having some semblance of comfort.