Comment: Pilgrim

Pilgrim
You don't mention how old your Patrol and CT are, nor what make and weight your CT is.
This makes it hard to answer. However, as long as your shocks are fine and you aren't going near the GVM you have been told a lot of rot by someone keen to sell you products you won't need.
Without a CT, and wil just two people in it you can do those tracks (don't know where you are going to at Lake Eyre) in a Commodore or Ford if the road is dry and you drive sensibly.
Assuming your vehicle and CT are sound, tyres are always your first consideration.
Lift- NO, springs- NO, new shockies/dampners- maybe, tyres probably if they have < 50% tread (you can always put the old ones back on when you get back).

Mark