Not sure what you are trying to accomplish, but air bags might be your answer? It was easy to beef up my 05, I added an extra rear leaf and cranked up the front torsion bars. With Rancho 9000's cranked to 9, it hauled weight really well, also towed a 10,000 lb 5th wheel. Kinda liked the adjustability of the front torsion bars.
I know it sounds ridiculous, but trying to set up the truck for more neutral handling, whether it be with custom-rate springs or just new oe-spec springs and shocks custom valved to the spring rates. But thanks for the input. Got a newer 2500 ctd for heavy hauling and my 350k-mile 08 half-ton is a daily work truck/beater that I’m trying to make a bit more fun.