We tow our 2010 MINI JCW Clubman 4 down, no problems.
Spent at least 6 months before heading out trying to decide between 4 down, dolly, enclosed or open trailer. Finally decided on 4 down because of the ease of hooking up and unhooking. Glad we did, 5 minutes tops to connect and no worries about where to store the dolly or trailer.
Bill & Joanne
2013 Newmar DSDP 4318
2013 Wrangler Rubicon or 2010 MINI JCW Clubman