We tow a Subaru Crosstrek with our 2012 Lexi 283ts without any problems at all. Just use the tow/haul mode when towing. We also use the cruise control when towing. Don't really know it's there until going up a grade, and even than cruise kicks in and maintains speeed. On interstates I maintain 65 mph without any problem.
Just be sure your Mini is rated to be towed 4 down. Cost for the proper equipment will run 2-3 thousand for bars, base plate, lighting, brake controller.
Grumpy