On my rack I once loaded 10 sheets of 3/4 inch plywood and 25 2x8x10 studs, the thule never moved, the car looked like a low rider but the rack was fine. I've never had a yakama, so I can't say anything about them, if you get the thule spend the money and get the wind deflector. The rack on my wife's 98 pathfinder makes a good deal of wind noise. It is mounted on the factory roof tracks. I didn't have a problem with the old rain gutter style mounts. You could go either way on you're shell.
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