Rack width is 9.3" and Topeak MTX Trunk bag EXP is 8.3" in width. So should have enough room for that model. I do like the Ortlieb trunk bag more for weather. That bag comes with a pannier bar that I don't need obviously. But I don't know if Ortlieb's quick release base plate can be mounted without it. Maybe somebody can enlighten me with that setup.
Lars