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    Question: Which will tow 13k trailer better: 2500HD or 3500HD

    I had a 6.0 gasser, traded for my Duramax 2500 and the difference towing is night and day. 2x on the difference in mileage and fuel costs - I've fully paid for the upgrade to the diesel with the better mileage. One of the big reasons I didn't do a 3500 was that they are (were, at least) only...