There are a lot of factors on how hitch weight and weight distribution affect your particular setup:
1. Wheelbase of tow vehicle
2. Distance of hitch to rear tow vehicle axle
3. Distance of hitch to trailer axle(s)
4. Level of tow vehicle and trailer
5. Amount of force exerted at weight distribution hitch
I was able to get near even balance of hitch weight on the front & rear truck axles and trailer axles with my F250. My 5500 loads the front truck axle less and trailer axles more using the same trailer, WDH and extension with only the first two measurements changed.