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| Most rigs only have one leveling valve; generally mounted in the center of the axle. It simply establishes a ride height. If you get loaded heavy to one side the truck/trailer will roll to that side. Even if you're loaded evenly you're still going to experience 'the motion of the ocean' dealing with ruts in the road or going hard into turns...
You can install a second leveling valve. Just make sure they're both located on the same axle and at the most outward point they can safely be mounted without risk of being torn off.... It doesn't perfectly correct your problem but it goes a long way. I just added a second one to my tandem this spring and it removed a lot of that rocking you get with a high sided load.
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Semi leveling valve
