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I use a SportWorks tray on mine - it's a spiritual predecessor to the Thule Sidearm 594XT. I like this tray more than the fork-mount variety because you can put anything up there (like my 29er w/ thru-axle fork) without removing the front wheel.
BTW - if I didn't find the pcar RTS used I'd probably go the Yakima route.
I use the Porsche factory bars with RockyMount Pitchfork trays. This is a very solid, low profile setup and I'm really happy.
Andy - Is that a Thule wind deflector you have installed? If that eliminates the whistling, I'm "all in".
I'm actually not certain who makes it - I bought my RTS used and the previous owner threw it in. But I definitely recommend getting one. There's almost zero noise from the rack.