I tow a 2010 Mini Cooper Clubman S four down and love it. It's been with me from San Antonio to San Francisco to Washington DC and lots of places in between with no issues. See my setup in my signature. Your Mini is a manual transmission I'm assuming.
Washington DC Area (NOVA)
Camper: 2004 Damon Daybreak 3285 WorkHorse 8.1
Toad: 1996 Jeep Cherokee XJ 4x4 - BlueOx
Toy: 2012 Ninja 650 - Versa Haul VH-SPORT-RO
Spent three years full time, so I know a little about it.