The GM 2500 does not have an upper overload spring. To get back to relatively level requires more air bag pressure than what you are used to in your Ram 3500 or my Ford 250 w/ camper package. Adding additional overload spring capacity will help Billtex with leveling his load.
My 250 sits 2" lower than a 350 with the same suspension due to shorter axle blocks. I pretension both upper and lower overload springs sooner with StableLoads so the rear only sags 1-2" instead of 3-4" without StableLoads. Billtex can only do that on his bottoms which would not be enough.
We both agree that a softer suspension will sway more than stiffer one, but I think there two issues to address (sway and sag). Billtex is taking the progressive approach to improve handling and I believe he is doing this smartly.
