If you would be 5800 lbs, I'd go get a set of FJ80 axles and run them. Thats an ungodly amount of weight.
For 35s, the 8" diffs seem to hold up just fine. Look at what the Ftoys.
5800lbs is ridiculous. You know that any minimal beenfit to the crazy suspension is gone due to that weight. You'll sink in everything, and have not enough power to get wheelspeed.
A leaf sprung 4 cyl jeep would wheel better than that thing. Seriously, would wheel circles around it.