Changing the rear springs on my 1500 Laramie

[JLBrooks7]

I am thinking of changing the rear springs on my 21 Laramie. When I put a load in the bed, or a slightly heavier trailer, the truck sags almost down to the stops. Thinking of changing the springs to the 2500 series rear springs. Thinking this will help with the sag, but worried it lift my rear up more, unleveling the truck. Think it will work?

 

[Scap]

What about some air bags for helpers?
That way you don't sacrifice your ride quality while unloaded.