I'm looking for a 2013-2014 Screw with Ecoboost and I'm not able to find out what the difference is between the Trailer Tow Package and the Max Trailer Tow Package. I've found a truck I am interested in that has 3:55 gears. The dealer is telling me the only difference is the Max Tow has 3:73 gears, nothing else. I don't believe this. How can you visually tell if a truck is equipped with the MAX Tow Package? Auxiliary trans cooler? Larger rad?