Wind noise is pretty normal with the installation of a roof rack, but what you can do is install a fairing like part # RRRF2 and the wind noise will be greatly reduced.
Fairings are designed to direct the air over the rack to prevent the noise. view full answer...
What dolly do you have that sways when unloaded? If it's a Demco you'll need to insert the pin that defeats the auto steer feature that allows the dolly to track behind the tow vehicle better. view full answer...