Bottom line. In a static situation, a weight distro hitch doesn’t move much weight from the truck’s rear axles to the front. The real impact of a weight distro hitch isn’t felt until a rig tries to porpoise. When that happens, the weight distro hitch pushes back against the porpoising, reducing both it’s peak amplitude and also helping to rapidly end the cyclical porpoising action.
Discussion. #'s from this post. Working trailer tongue weights on a truck scale - Paddock, Spares and Towing - SpecE30 Community Forum
Loaded trailer weight 8520 lbs.
Weights hooked to trailer but no WDH
Weights hooked to trailer with WDH on
What this tells us.
-The WDH hitch moved 80-90lbs, half of the 160-180lb difference, from the truck’s rear axle to it’s front. Not much.
-The WDH move 20lbs off of the trailer’s axles and on to the truck.
What’s interesting about this. A lot of folks have the idea that a WDH moves a lot of weight from the truck’s rear axles to it’s front. People will talk about “leveling” the truck using their WDH. But we can see here that all the WDH did was remove 80-90lbs from the rear and add the same amount to the front. Not a way in hell that you’re going to level a truck by moving such a paltry amount weight.
People also talk about WDH’s keeping the truck’s front weighted for improved steering control. I’m talking a static situation where there’s no porpoising. There’s almost 3000lbs on the truck’s front axle–no way putting another 90lbs on the front axle is going to make a difference.
The WDH was set pretty tight. I have to use the trailer jack to lift up the center of the rig in order to hook up the WDH. If a person hooks up their WDH w/o raising the center of the rig, the WDH is probably doing nothing.