I honestly wouldn't worry about too much margin in the pulling department. but you will notice that the "Whoah" is what you should really worry about. I know that Ford has a fix coming in 2015 with a 2nd gen 6.7 motor. But RAM has the solution already. Check out the article
http://special-reports.pickuptrucks.com/king-of-beasts.htmlNote that they pulled these vehicles over the same exact area that you are thinking of. And the Ford is technically in a higher class but when you look over the specs, these vehicles are basically equivalent.
