Hi, I am new to this forum. We bought a 2013 C-Max a few months ago with the specific intent of towing it behind our motor home. Turns out we are now also using it as our primary vehicle.
Initially I was having problems with the battery draining after about 4 hours of towing. I suspected the charge line we were using was inadequate. Therefore, I just recently installed a Toad Charge from LSL Products. Had my first real test of it this past weekend, and it worked great. No battery problems after 2 different 6+ hour stints of towing.
I made a video of the installation, so I'll share it here. https://youtu.be/dYA5kwHr084
By the way, we chose to go with primarily RoadMaster towing gear, but we do use a Blue Ox Patriot braking system.