I tow a 2016 Mini Cooper Countryman. But... Mini's can only be towed 4 wheels down if they have a manual transmission. And BMW does not warranty a Mini if it is towed (I hear). Since I bought mine used after the warranty ran out, it's not a problem. I have a Blue Ox tow bar and baseplate. I have battery charging through the light connection. I have an RVI Brake, which provides braking. In most states, only an emergency breakaway brake is required if towed vehicle is under 3000 pounds, but I like to have the brake in there anyway. It is easy to hook up, which I do by myself.
The Countryman is the largest Mini. The S model is turbocharged and pretty peppy! I enjoy driving it around town, and since it weighs less than 3000 pounds, it is easy to tow! The downsides are: (1) there is not a lot of baggage space, (2) it is like a sports car, a little rough and noisy, and (3) it is pretty crowded with 4 full sized people in it. And if you don't like to shift, it won't work for you!