I did it with Old Man Emu XJ leaves.
http://www.pirate4x4.com/forum/showthread.php?t=768019
If you decide to do it, but good leaves from the start. It rides so much better with these leaves it's silly. Flexes plenty well too.
That said, if you can swing it then go 4-link with coils and shocks w/ an anti-roll bar.
My Jeep will be getting torn down some time in the near future to cut the tub in half and redo everything basically. Downsizing to 37s or 38s, Toyota Landcruiser axles, trying to drop it down to around 3000lbs, etc etc. I'm going to be 4 linking the rear, probably another 3-link up front this time too though but with coilovers hopefully at all 4 corners but we'll see....
Point being if you plan on doing this, I may have my entire setup for you to buy off of me, bumper, leaves and all.
This is the closest to a sidehill pic I've got:
Roughly 12" of stretch, here's a pic to get an idea of the overhang in the rear. With the new leaves it's a bit of a better angle though(replaced because my bastards packs blew ass).
