Just traded 2012 2500 Silverado LTZ CC/SB 4x4 duramax for 2015 3500 Silverado LTZ CC/SB 4x4 SRW.
2500 had 10,000 gvwr, but @ cat scales, already weighed 8100 alone. Pin weight of 2300 put us over with driver and passenger.
The 3500 gave us the cushion we needed, and our first trip(just set up!)
showed a better ride, and no chucking! Have to see if it's the truck, or the way we loaded!
Only complaint: truck had been "leveled", and squatted when we hooked up. We'll live with that, or lower the front back to factory.