I don't have tandem axles but have seen a lot of posts. These causes pop up in posts.
Weight is unevenly distributed, test by weighing both axles only and then the front or rear axle separately. This could be caused by loading and/or pulling nose high or low.
Also possible is brakes on one axle working harder than the other.
Last is a bad axle putting tires on the road improperly.
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