That's really the issue with newer Fords with the all aluminum body - they're rated to pull and carry more because they're lighter, but they're LIGHTER which isn't always a good thing. As you discovered, that light (I'm guessing) aluminum-bodied Raptor didn't have enough weight to help slow you down. I mean it'll do it, but you've got to be 100% aware of what you're doing.
For instance, between my wife, me, and my FIL we have 3 trucks: her F150, his F250, and my PW. Her F150 supposedly has a curb weight of about 4500 lbs. His F250, with the 7.3 Godzilla motor, comes in at about 6200 lbs. My tank of a PW comes in at over 7k. Having pulled a lot of the same trailers with both his truck and mine (we don't usually pull much with hers, though that 2.7 twin-turbo has some giddyup)...I'd rather have my PW. It just feels like I've got more control over what's behind me.