I just grabbed a pair of Pro-Rack Whisper bars for mine. They had a channel under and over, allowing me to fit an awning to the side, with a strap point on the end. The bars cost me about $250 and the adapter kit about $75. Supercheap Auto if you're in Australia.
I did add an Aldi aluminium roof basket to it too, it's fairly light and doesn't add much to the noise levels.