I've been towing a 2010 Fusion for about 25000 miles, and have had only one issue. The trans burned up one really hot day in AZ. after towing for only about 3 hours. The trans was replaced under warranty. I got in touch with a customer rep at Ford and after tons of questions, I found out that Ford is having an issue with the transmissions burning up while being towed 4 down. While the car was in the shop having the trans replaced, I talked the mechanic into cutting a fairly large hole in the plastic cover that is below the trans, to allow more air to circulate around the trans pan.
The owners manual says to stop every 6 hrs. to run/cool the trans while towing. The mechanic suggested stopping every 2 to 3 hrs., and to NOT tow over 60 mph. This is not a problem for me, but it may be for some folks. Following these guidelines, I have not had a problem for about 22000 miles of towing.
BILL & CINDA SCHWARTZ
2005 SEABREEZE LX 8360
W-22 WORKHORSE 8.1 LTR.
BEAUTIFUL PHOENIX, AZ