I am towing a 2015 Ford Focus and following the tow procedures you mentioned. SW Driveline in Yuma placed a sissors/blade cutoff on the positive pole even though the instructions say to disconnect the negative pole----and I drove to Pomona and back without any problem--then SW contacted Ford, and I go in next week to have a smaller cut-off placed on the negative pole after the battery is rotated. Currently the negative pole is back underneath the windshield frame, that is why the positive pole was initially used.
Yes, all the electric is disconnected, but in my car without all the added trimmings, only the clock and date were affected and the odometer as well. Watch out for dealerships that follow another towing guide and say all one has to do is put car in neutral and turn key to accessory---in that case, according to the manual, you can drive 30 mph for 50 miles in an emergency!!! Service manager at Yuma dealership told me to do this as well as the 'flyer' they use. So follow the info in the manual and contact Ford.
joanne harnit