Would something like this work? I'm not sure what the diameter of the tube is, but they have several. Awning Mount Tubular Clamps StandardIts interesting how anything will get set up on this tubular rack. I am looking into awning myself and I am scratching my head there. Seeing how they propose online it being freely attached to nothing when it comes to this roof rack. I am hoping there will be options down the road or I might be looking into custom set up.