Mine is the 1528 x 1236 - I went narrower than Rhino recommend and used the RLTP legs instead of the RLT legs.
The size is a good match for the roof:
 
I went narrower as I didn't want the overhang on the sides. To me this looks a lot neater but does comprise storage space a bit as you lose one slat. It doesn't bother me as I don't put a lot up there. It will fit a tyre, a jerry can and some Maxtrax, with some space for firewood. I also have an awning and shovel up there.
Wind noise is very subjective. There is some, but not as much as I seem to get from the RAI. I notice it because the Disco is so quiet, but it doesn't bother me.
There are more photos of it with various loads in my gallery.
http://www.aulro.com/app/showgallery.php/cat/1293
Cheers,
Jon
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