I was thinking about doing a custom 4-link setup on my JKU
Brilliant minds think alike
I plan on doing this, but most probably not until the winter, so don't have too much to offer right now.
Relocating the gas tank will be the first job, GenRight offer a tank that fits at the back (requires removal of tool/storage thing) and that is one solution I'm considering. I'll have move my coilovers over the axle too, most probably up into the trunk area.
I plan on triangulated upper arms and straight lowers at the rear. The uppers will run to a truss and the inside of the frame rails, the lowers will run from the side of the axle to the frame, haven't decided if inside or outside the frame yet, but they will mount at the centerline of the tubes, so there will be nothing hanging down below the axle at all.
Arms will be DOM with a LH thread Johnny joint at one end, and RH thread Johnny joint at the other, so I can rotate the DOM to adjust.
There are a few suspension geometry calculators around that will help with anti squat calculations etc.
Be interested in seeing what anyone else has done...