I agree with Greg on the rust free utes/vans. I bought one a while ago. It was rust free in all the right places..... until I got it home, when all this rust appeared in the plenum and B pillar. Must have rusted on the trailer on the way home.
The only rust free ute body west of Sydney I know of is my WB and my brothers WB. Have not seen another in 10 years. I know where there is one though, I just cant get time to get over and look at it.