Checked payload and towing capacity on the Ram website for my new 2500 Crew Cab 4 x 4 with Cummins arriving in a few weeks. Payload is 1988 lbs, slightly lower than what I wanted but ok with it. However, the tow capacity was a surprise. Came out at 20,024, above the max quoted by the Ram towing site for my truck configuration at 17,290 or about 2,800 lbs more! So any ideas on why this happened?