Robert,
I also purchased a 2015 Ford Focus last week. In the owner's manual it states that you must disconnect the negative battery cable to flat tow. You would also have to run a power cable, either from the motorhome or before the battery disconnect to power the emergency break away and depending on the setup, the auxiliary braking system.
I haven't decided if I want to flat tow or use a tow dolly. Keep us posted on how you make out.
Fred
__________________
|