I've got the older Ecoboost F150 (2013) and it has the 20" wheels and max tow package. But, they are different for your era of Ecoboost..
I'm not really sure what the 20" wheel package does? Even the P OEM tires exceeded the rear axle rating of #4050. I did get some "XL" rated 20" tires for it and that even exceeds it even more..
I'm towing a #7000 GVWR TT and that's about all I want to tow with my F150 and still have a comfortable tow.. Sure, it has all the power you can need/use... But, it's still just a light duty truck, no matter what that 'max tow' means...
Good luck! Mitch