I mounted a Thule rack on my WRX. It was used and so I didn't have any instructions. I just eyeballed it. I think the position of the rear bar was dictated by the shape of the roof, i.e. the pillar gets wider farther back and the clamp can only reach so far, so I put it as far back as possible. I'm sure it was more than 18 inches. My skis never flew off, really I have a hard time seeing what could go wrong with this setup as long as you get the pieces locked down right. YMMV.
that's all i can think of, but i'm sure there's something else...
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