Some sag in the rear is normal but shouldn't be more than an inch or inch and a half when the weight distribution bars are installed. The front should be returned to normal ride height with properly setup weight distribution. I sag 1" in the rear with 900 pounds of tongue weight and front suspension sag or rise is zero from unhitched height. It takes some mighty tension on my weight bars to achieve this. I have to hitch the ball to the truck and then use the power tongue jack to lift the trailer tongue and rear of the Expy almost to its full extended height before I can muscle the weight bars on with the pry bar tool. Then I retract the tongue jack and all is level and good.