I have a 2016 3921 and have put over 30,000 miles on it, back & forth across the country twice & up & down the east coast a few times. I'm usually 500 to 1,000 pounds under the 26,000 lb limit plus we tow a Honda CRV. The gas v10 does fine. If im struggling up a pass or big hill so is everything else that is anywhere near the same size.
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