The runner would be more money, but more ideal for a stock truck. Specially if you did an IFS swap w/crossover steering. Really. IFS swap, body lift, small suspension lift, long shocks, tires rims and you are on your way.
If you arent going going to hit a lot of mud, then profield birfs, or home made clamp rings. If some mud and sand will be common, then the yukon birf eliminater. You weld the yota center easily enough, but keep either a spare 3rd, or a spare gear set for at least one diff. The gears are weak, and welded up you might have trouble.
If you do want to do an xj because they are so common down there, just spend the extra few bucks for a lunchbox in the front.
You cant spool the back unless you find a 44 due to c-clips in the 8.25. But a spooled 44 will treat you right all day long for what you are doing.
Get some goodyear kevlars. Keep the weight down but the durability up. They are a very tough tire for the weight.
Plugs plugs plugs. Tire plugs till you puke. Get a CO2 set up for air. That way you keep it when you ditch the rig.
Have your jeep specific tools on hand, and have fun. Sounds like an epic adventure, Take some pics and let us know how you are doing.