I have had 32" swampers on my rig for the last ten years. At first I only had a SPOA, with the seam on the inside of the fender well hammered flat. Then I went too a 1" Sky body lift, and then some Con-Fer 1" shackles. The 1 1/2" lift did not make much of a difference in the fit of the tires. I also have some SpiderTrax wheel spacers, I am not sure if that makes a big difference other than the turning radius.
And be sure your bump stops are where they should be. Better for the axle to hit the bump stop than the tire to hit the body.