Explorer 2.3L Ecoboost 5300 lb Tow Rating

Hi folks. Any idea on what makes the Explorer 2.3L Ecoboost with the 52T Tow Package suitable to tow 5300 lbs when the 52T is only adding a hitch and plug? Usually a tow pkg adds heavy duty cooling, larger brakes, and stiffer suspension but none of this is stated in the Ford Tow literature. I find it hard to believe the stock Explorer already has these goodies. I asked 2 Ford dealers and they couldn’t provide any specifics. Does anyone have any “specific” info or experience with towing with one of these? I called the Ford Help desk and filed a case #, no response. So I’d rather not trust the claim but get more information t substantiate the claim. My antique boat and trailer are 3200 lbs without brakes so I want to be confident the Explorer is capable and safe. Greg, Phila, Pa.