I havent dont that, but I did rebuild/move the hangers on my Dakota. Honestly I dont see how it would be too hard to do. You will have to cut off the old hangers from the frame and spring plates from the axle, move the spring plates and weld em back in. Front hanger is a solid mount (no shackle) right? If so, just fab up one on the frame rail. Could be as simple as DOM tubing gusseted in. Same for the rear. Heck, give it a shot fabbin up the mounts before you cut the old off. That way youre not completely sunk if you get in over your head. Maybe look into some jeep shackle/spring over stuff.
My real question is why? What are you trying to gain with this?
Also, search the board. You will get many ideas from those results. Dont expect to be spoon fed here.