Coilovers to Adjust Rear Ride Height?

If you can find booster coils that go on TOP of the rear axle, between the frame and axle, the load won't be on the shock mounts.
You used to be able to get them at camper/trailer stores.

It will pick up your rear a few inches, but will ride kinda bouncy.

The 1500 lb JC Whitney leaf helpers bolt on top of the leaves, and you can
load up the tension as little or much as you want to tune the height.
You can also use them to "get by" for a while with one broken leaf in the pack.