My D3 has done the Simpson Desert west - east via Mt dare and up the Hay river track as well as a trip to Darwin via the Oodnadatta track, the High Country, Fraser Island and assorted other locations as well as being a daily driver. It now has over 200,000Km on it and has not had failures on any of these trips. My equipment list is below:
ARB bullbar
ALDI winch
Factory RAI
short Windcheetah roofrack with spare tyre carrier
Dolium rear door ladder
Long Ranger Fuel tank
Intelligent 4x4 wheel carrier
Home made rack and cargo barrier with a fridge slide
Land Rover headrest TV screens fed by a WDTV media platyer and USB Hard drive
Lightforce XGT lights
Traxide Dual Battery system with Optima yellow top battery
Foxwing
40 Litre footwell water tank that can sit behind the front seats
General Grabber 18" AT2 tyres on standard rims with a second spare the same
LLAMS height control 
ARB compressor mounted under the bonnet
ICOM IC440 UHF
The list above is the culmination of the bits we added for the Simpson trip and there isnt much else I will do to the vehicle. As the kids are growing I'll probably redesign the cargo barrier and fridge frame and rebuild it in aluminium so that it incorporates a different water tank but that is a slowtime project. 
The only other suggestion  have is go and get your transmission serviced and keep the oil changes up to it as I had to replace mine prior to the simpson trip due to torque converter failure. There is plenty of info on here about that though.
Before I fitted the winch and the extra tank in the Vic high country.

Regards,
Tote
				
			 
			
		 
			
				
			
			
				Go home, your igloo is on fire....
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