Living in a country that has a lot of toyota trucks i can tell you that the tundra is only made and sold in the USA and any the ones you see anywhere else in the wold(U.A.E.,Saudi Arabia, Japan and maybe Australia) are imported and sold privately. So no RHD versions.
Do you guys in oz have the new shape cruiser pick up with petrol enginse(4.5 efi?) I just sold my old shape 'cause i'm getting the tundra but man for sheer toughness nothing beats the cruiser pick up, will see how far I can push the tundra off-road though.