Manual hubs are a good investment, Auto hubs can fail anytime and you don't know they have failed until you NEED 4WD, lol, so worst possible time.
Your front axle is an OPEN type, which means the easiest axle(side) to turn gets 100% of the power, if 1 auto hub fails to lock then it gets all the power in 4WD so no power at the front wheels at all.
3.0l is not a power house, you can free up a little power and get better MPG by removing the mechanical radiator fan and using an electric fan in it's place, not a hard conversion and if using a fan from wrecking yard not too expensive.
Mechanical fan uses horse power and fuel, when ever the engine is running, cool/hot 10mph or 70mph, always running.
E-fan does use alternator/battery power, but only when rad is warm and air flow is low, driving slow, above 50mph it will usually shut off since air flow is high.
And for off-road you can install an OFF switch for water crossings, the fan, mechanical or electric can soak the upper engine bay if water gets too high, which can cause shorts stalling engine, "mid-stream".