Thanks so much, everyone! My mini has the exhaust in the center, I am not sure (and can't tell from the pics) if the hitch will work even with the exhaust there (I know the mini - non - s models don't have the exhaust there).
My mini has to live outside, our garage is now a bedroom for the teens.
Having said that, we went biking in Austin recently with both sets of bikes...roadies on top, mtbs on back...and pulled into a hamburger place and nearly took both bikes off the top on the awning.
University Cycles came to our aid and repaired my husband's bike's shifters and my computer that was torn off...saving the day (and the trip).