Can your Mini tow a trailer?
I built a custom hitch for my 03 base Cooper. It is a 1.5" receiver type. I hung it below the rear bumper, didn't remove the backup light. I bolted it to the aluminum bumper support and made a strut rod to prevent it from rocking which attaches to the rear subframe. Yes it required welding. I also put on a flow disaster muffler, which makes it sound a little meaner and probably added about three fourths of a horsepower.