3 Leaf Progessive for Rear Lift Only

On my 2018, the rear leafs appear to have sagged about 0.5 to 1.0 inches permanently while unloaded after going to payload capacity or a couple 100 lbs over for a few camping/wheeling trips. When fully loaded for camping/wheeling, I figure I have about 500 lbs on the rear, and at that point I have full on bro lean with the rear approx. 0.5 to 1.0 inches below the front. Im a big fan of rake, and want at least 0.5 inch of it when fully loaded. My plan is to lift the rear first, load it up, let it settle, and then figure how much I want to lift the front, if any, to keep the rake while fully loaded. In the end, while fully loaded, would like to have at least an inch of lift over the stock unloaded condition to improve departure angle.

I would also like to improve handling (keeping wheels planted) on wash boarded roads at realtively high speeds (say 50 mph, give or take). I realize that shocks are a bigger part of the equation here, but figure leafs have a role to play as well. I will also be replacing the shocks too, likely with something with reservoirs to prevent them from overheating on long distance travel on wash boarded roads. I will likely also do a shackle flip with better bump stops.

Lastly, most of the time, my truck will be a DD with only 100 lbs on the rear constant, such that I don't want to lift the rear while unloaded any more than I have too, as it might be some time before I do a lift on the front. Maybe air bags are the way to go, but I am worried about their performance on wash boarded roads and lack of articulation when wheeling.

Ride quality is not a big deal, and I figure I'll leave the overload leaf in to help with maintaining lift when fully loaded.

What are my options for 3 leaf progressive packs given the above?