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If I recall, the gas tank is on the drivers side of the truck. The extra weight of gas may make the truck lean towards that side. See how much the truck leans at full, 1/2 and 1/8 of a tank. This should determine if the extra weight of gas creats this issue. Also, the same spring (same spring rate or similar) would be used for both rear springs. Over time one side will sag if it experiences a continuous load.
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