I did just look in truck manual and under weight distribution section, it showed the following
Vehicle Series Trailer Weight Weight-Distributing Hitch Usage Hitch Distribution
1500 Up to 3 175 kg (7,000 lb) Not Required 50% 1500 Over 3 175 kg (7,000 lb) Required 50% 2500/3500 Up to 9 080 kg (20,000 lb) Not Required 25%
As mentioned, I have the 2500. That is some crazy weight that they say WDH not needed.
I will see if I can find hitch ratings.