BigGriff023,
I have the RPG RST 16 system with 3.5's, and Deavers/drop shackles in the rear. You still need to put a hole on the passenger side of the bed so that it mirrors the driver's side by the gas fill. Droop? 24"!!! I have 20" limit straps with welded brackets to axle tube and frame, limiting the droop. On extreme articulation the tires have rubbed on the adjustment tubes once on the driver's side; moved the lower shock mount 1/2 inch towards the center, and none since.
The rougher the trail and the higher the speed the better the difference can be felt. Daily driving the truck is a bit smoother though it feels a bit looser like the back end wallows somewhat.
I had an unexpected flight on Dirty Dozen 3, and afterwards could not bring the driver's side front wheel into alignment; I purchased a set of the Icon upper A arms from Silverback, (Thanks Ryan!), and am very happy how the truck handles.
Overkill? Yes. However I have over 100,000 miles on the truck and hope to get 2-5x more! My original shocks had 85,000 miles and still rode well...no leaks, and rode smooth even on the roughest roads. The larger shocks will hopefully last as long, especially with the better ride that the Deavers impart....
Negatives? The size of the hole in my wallet. Need to modify bed for passenger side upper shock mount. Need to limit droop to protect brake lines/shocks.
Eddie