As the OP I want to thank all of you for your input. I looked over all my research material and found that my answer was 1 line above in the 2016 brochure. I found that the 2010 pound remaining payload left on my 2500 6.7 Cummins is a penalty for having diesel power. The same 10000 gvwr 2500 truck with a 6.4 Hemi V8 has a payload of 900 lbs more. The front and rear axles are the same 6000/6500.So my penalty is having a Cummins that weighs 900 more lbs. Causing such a low payload. Ironically the 6.4 Hemi pulls 1600 less so there you have it. Not a 3500/2500 discussion but a screwy rating that is penalized by a much more capable engine. I have my answer.
