Which Spring Enhancement for Ram 3500 hd DRW crewcab longbed

I have had very good luck by doubling up the secondary springs (the ones above the main pack) and adding Stable Loads so all that weight bearing prowess will come into play sooner. I have had 5000 pounds of crushed rock in the bed and there was very little compression of the suspension and the truck was well under control. You are on the right track.
regards, as always, jefe