I now tow a 2015 Equinox FWD all four down by pulling the fuse as stipulated in the owners manual. Having said that, let me tell you what CAN happen without you even knowing. I had a 2010 Escape that, according to the owners manual, could be towed 4 down. Well, after Ford replaced a couple of hundred rear ends, they issued a supplement to the owners manual stating that the 2010 Escape can not be towed 4 down. The Ford dealer didn't even know it. I found out the day before I was having a base plate installed on the Escape and ended up trading the Escape for the Equinox. Maybe I could have pressed the point with Ford, but I have no patience with bureaucrats or lawyers. So, if your going to check on the tow ability of a particular model and year, be sure to check whether there has been any changes since the owners manual was printed.
Bob