We have been flat towing our 2013 Focus for last couple of years following the exact procedures as recommended in owners manual. Since we are using brake buddy, I ran a separate power line for the brake buddy which is alway hot. The negative which is also ground is connected to the frame which makes easy to disconnect. I did have had transmission problems couple of times which I thought had to do with flat towing. But it was not. Ford diagnosis showed bad control module, which I found out is pretty common with Ford Focus. It has to do with their design.
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I have driven over 6000 miles towing my 2014 Focus and have disconnected and reconnected the negative cable at least 3 dozen times. I disconnect the Black Negative Cable and when I reconnect, I have it set that it's loose enough to take off and put back on without using a wrench. I replace the battery cover and have never had a problem. It might not be the most proper technique but it works for me.
I posted a slightly modified version of the battery disconnect solution discussed by "hdmoxness" in post 19 of this forum. I think I gave detailed instructions and photos to anyone that wants to attempt this. Depending on how much room is under the hood (in the Focus - not much!) this could be adapted to other cars as well.
2014 Forest River Sunseeker 2650S
2015 Ford Focus Titanium Hatchback DCT auto