I had the same issue with my Pinnacle, It was 1100 pounds heavier on the left where the kitchen and bedroom slides are as well as the bathroom... I measured the distance between axles, and that side was about 3/8" further apart due to the springs flattening out... the way the suspension is designed the axles will move further from each other with more load... I am considering converting to torsion or air bag suspension, but in the meanwhile I upgraded the springs on the heavy side, stock was 3500 pounds each and I replaced them with 4000 pound springs.
The trailer is now level side to side and the axles are the same distance each side, I had replaced the tires at the same time and have not seen any uneven wear.. fyi, I went with the Goodyear G-rated RV tires and have been very happy with them.. also got the springs from the Lippert online store
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2016 Pinnacle 38FLSA
2015 2500HD Duramax
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