I found some interesting info on 4wd Action video on the Tube. It may be basic information for some but for others who are new to truck suspension it could be helpful.
The part I found most useful was the section on leaf spring tuning based on loads and how to identify if your truck is over or under sprung. I had a look at my springs with the bed rack, traction boards, shovel and spare tire mounted (approx.. 200lbs) but without the RTT (150lbs) and all of the heavy camping gear. It clearly looks and FEELS over sprung. I recently removed 150lbs of sandbags from the bed and that made a significant difference in ride quality. The harshness is back and the truck wants to buck when going over sharp bumps. The Icons keep things under control but just barely. With the sandbags in place the ride smooths out and feels great. Especially when I run 200lbs worth. Keep in mind on my setup I am using the OEM leaf pack with an Autospring AAL which ups "capacity" by 750lbs and raises the rear 1.5" to 2".
This is with the truck sitting flat on the ground with about 200lbs worth of gear in the bed but no sand bags. I'll post updated photos later with the sandbags in place.