I installed a Tubus Airy from Perennial Cycle. With a couple of minor issues, it works great with the Ortlieb Back-Rollers I ordered along with it. https://www.flickr.com/photos/736351...h/30053602535/
Issues still in progress: Fender vibrates against the cylindrical strut bracket because of insufficient clearance and at the front of the rack and against the rear light because the light mount bracket rotates downward toward the fender.