This is my rig with 6.5" coils paired with SOA on 2wd leafs and a 1"lift shackle. It was slightly higher in the rear.
During acceleration, the leaf pack will want to twist due to the torque. A traction bar mounts from the axle tube to the frame and they prevent that twisting effect. If the packs twist far enough, you will damage them and also run the risk of snapping ujoints.