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Here is a link to a trip report I did in 2013.

http://www.nissanpatrol.com.au/forums/showthread.php?24026-My-Fraser-Island-Trip-Report-Oct-2013

Ngkala Rocks bypass is another spot that catches people out, we could not get passed last time as there were 3 vehicles stuck.

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That means you miss out on places like this.

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If you have a 2 inch lift and have lowered tyre pressure everything should be easy.
As Gaddy said, travel at low tide and never get tempted to drive into the surf as lots of people get stuck trying...