We bought a 2013 C-Max SEL. We went to Blue Ox factory where they used our C as the first baseplate fabricated for a CMax. Because it was a hybrid we didn't want diodes, and Blue Ox installed separate lights/wiring to tail lights. We used Blue Ox Aventa LX tow bar, and Blue Ox Patriot Brake. (At the time we had a Class C with a 3500 lb hitch rating, so CMax fit within that limit, and we loved the cargo space in Hatchback CMax.). We were happy with all the Blue Ox equipment except the Patriot seemed to tip over a lot, then applied brake extended time thus "we had alarms on the wireless receiver" inside the Class C; and we discontinued use of the Patriot.
However, we spent the next 14 months trying to hope Ford would identify and find a permanent fix for the parasitic battery drain that was common in that model year (?don't know if it has been solved later years? But do know from experience ...dead battery issues had nothing to do with towing ... Only 1 time when towing behind MH of 6 times in first year dead battery, four times wrecker back to dealer from our house and our town.)
For us, even the better mpg on CMax with all the inherent battery issues was not worth the lack of a reliable vehicle. Just surprised Ford never was able to overcome that issue. Good lookong car, but ....
When we moved to a DP with 10K hitch rating...we traded the CMax in on a new Jeep GC, added SMI AFOne, and we once again have a vehicle that tows great and is very reliable.
Safe travels to all