When 1 side is level and the other isn't, the solution isn't that difficult. The connection needs to be adjusted on 1 side to allow both to be level once the weight distribution mechanism is adjusted properly. Since the trailer tongue can't be changed easily, the hitch on the truck needs to change to one that places the ball at the right height. With the trailer removed, jack it up to sit level, back the truck up to the trailer tongue and see how much of a drop you need on the ball to have your truck sit level and then go get a hitch draw bar with that amount of drop. Put the ball into the new hitch draw bar, put the draw bar into your under truck hitch assembly, and hook the truck to the trailer - now adjust the weight distribution mechanism to have both truck and trailer level, and you're done. If you've never done this before, have your trailer dealer so it for you as long as you can watch - oldjeep offers very good advise, you need to have the understanding of how to do this yourself for both safety & convenience.

 

The mechanism that tries to transfer the weight from the rear hitch to the front suspension of the truck are the bars themselves. When you tighten the bars, they rest on the brackets that are attached to the trailer frame. This pushing down on the trailer frame is actually transferring a tilting force on the truck chassis that counteracts the tongue weight. Some of the tongue weight get to the front suspension and a small amount to the trailer axle.

The weight distribution bars are designed to work with specific weight ranges and typically, the brackets have to be mounted somewhere about 28 to 30 inches from the ball.

The way I set up my hitch was to set the trailer on a flat even surface and level it to the way I want it to sit when hooked up. I measured the distance from the ground to the bottom of the trailer hitch, right below the socket where the hitch ball goes. In my case the distance was 18 inches. I then put my truck in flat level spot and measured the distance to the trailer hitch ball bottom, I don't remember what it was but it doesn't matter, let's say it was 25 inches. Next I measured the distance from the ground to the inner front fender well and did the same for the back. So I figured that to get the truck to sit level when hooked up the front would lift 1 inch and the back would drop 3 inches. Ok now I have all of the info to set up my hitch, take the 25 inches and subtract the 3 inches and you get 22inches as the height of the truck hitch when hooked up. Since you need to connect a truck hitch that will 22 inches to a trailer at 18 inches, set the shank to be 4 inches lower.

Hopefully, when you hook up the trailer to the truck and adjust the bars, the weight distribution will force the back suspension down the 3 inches and the front 1 inch and the truck should be level.

hope it makes sense