Increased tow capacity in Braptor

So, I read the details on the new raptor and saw this:

"Additional front and rear jounce dampers help absorb the load after landing sweet jumps, while new braces on the trailer hitch help increase the tow rating to 4500 pounds."

I am one of the lucky ones who can got the note from Ford to convert to the Raptor at MSRP. While I am super interested I wonder what was done to increase the max tow capacity? If I could do that on my current badsquatch I might be happy with what I have - but...

Increased tow capacity in Braptor