Hi mate. If you do the Old Tele Track you need a snorkel. If you do it solo a winch is a must unless you bypass harder climbs like Palm Creek. A good diagnostic tool is a good idea (I had a mate in a D3 whose gearbox had issues with water in a sensor - a scan tool would have identified the issue (locking of the Centre Diff) and he could have corrected it (the mechanics up there don't have LR diagnostics). A UHF is very handy but otherwise a Sat phone if doing the OTT.
Cheers
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