Also your pictures show 11,400 as GVWR. That's for the Hemi. A SRW 3500 with 8' bed is 12,300lbs, and the Dually you are looking for has GVWR of 14,000.
Thats why it doesn't make sense. As others said your curb weight is going to be in the 8500-9000lb range. With GVWR of 14,000lbs, that puts...