Of course this is in their wording, but what is the difference in Heavy Duty cooling and upgraded cooling? With the Tow package you get a different final gear ratio as well and then with the FX4 you also have different wheels. I added both to my order.
I have been able to place an order and received a confirmation from Ford that it has been placed. They just have to go into the system to complete it, I would check around if they can't do it for you.