No go snow Prado

Normally we are desert dwellers. Cobbler, Gibson, Great Sandy, Great Victoria, Painted, Sturts Stony, Tanami, Tiriri, done em all. But occasionally we like to go to the Victoria High Country in the warmer months. Say round Mitta Mitta and do Disappointment Track (that's not Mt. Disappointment), listen to the cicadas in the Walnut trees.
Recently I said to the XYL, "After the next school holidays (in October), when the tin lids have all gone home, why don't we go and have a look at a bit of the white stuff?". "Brrr" she says "Brrr, anyway we can't with that Prado, you'd need snow chains, bit like those mud chains we used to use in 'Frica". In a way she's right, never heard of mud chains here in Aus. "Not a problem" says I, "We can just pick some hire ones up in Khancoban and mosey up through Tom Groggin and Thredbo and drop them off in Jindabyne. Nothing serious, we will give the Davies High Plains or Mt. Pinnebar a miss". "Can't" she says, "You have to fit them not just carry them, and you can't fit them to the front steering wheels of the Prado". Now about this time I realise she had been spending too much time snooping on this 'Splore Oz website. "Not a problem" says I, "There must be Prados tripping about in the snow. They'd be like those Nasi Goreng rabbits, millions of them. I'll just go up on the website and ask"".
So the question is : How do you cope with a 120 series Prado with 17" wheels in snow conditions? Do you just fit chains to the rears? Is it legal, or what?