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I am going from a 2015 2500 with 3.73 and the 5.7 to a 2019 6.4 with 3.73. The old travel trailer was 6500 lbs empty. The new one is expected to be in the 9000-10000 lb range empty (and be a 5th wheel). Be interesting to see how it pulls with the bigger engine and 8 speed transmission.