Dick_B wrote:
Seems to me if you measure the height above the ground of the front and back wheel wells before and after that should tell you if you need a WDH. I think the difference should not be more than 1/2 inch without the WDH.
What part of "auto leveling rear air bags" do you not understand?
In the link above by Second Chance I recommended that he did not need WD
BUT he's pulling much the same with a 2500HD Diesel.
OP, your 910lbs is with WD and probably 450 without. I would go with a small amount of WD which will decrease the amount of porpoising on a rough road.