Kelderman suspension

I have the “Two Stage” Kelderman on my dually. That’s the one that replaces the rear spring shackles with a big hinged bracket with air bags. I still have my rear leaf springs but they are floating on the bags. The main purpose is improving the ride while unloaded, and it works.
I don’t believe there is much benefit while carrying my camper.
The Two Stage isn’t terribly expensive and I like mine because my truck is also my daily driver to work and back.