How do I get the lift I need without shackles?

screeminDemon said
I don't think you could get a 275 tire on an 8" rim can you?

tirerack.com shows the rim width range for P275-60x15 tires is 7.5"-9.5".
I've got BF Goodrich Radial TAs mounted on 8"-wide rear rims and they're just fine.