Found this and again complements of the Triton Forum.Hope the PDFs work.
New rules for Bullbars ,Tyres and alot more.
Been posted before. I just did the maths on tyres, up to 7% diameter increase without requiring certification. On a Prado with 265/65/17 776.3mm you can fit anything up to 830.6mm. Therefore 265/70/17 are legal at 802.8mm.
http://www.myswag.org/index.php?topic=33604.0 (http://www.myswag.org/index.php?topic=33604.0)
Copied it over from the NSW & ACT 4wd Asso website ages ago. Obviously not too many people were bothered about it
Was also mentioned http://www.myswag.org/index.php?topic=33590.0 (http://www.myswag.org/index.php?topic=33590.0)
Had everything on the gq engineered years ago! I think I'd have a heap of trouble getting all the mods through these days! ;D