The specs for our 2016 Ram Longhorn 3500 dually are in my signature, but I'll repeat them here. Please note, however, that these ratings require the SPECIFIC drivetrain options shown in my signature. This drivetrain option package also gets you an 11.8" AAM rear axle (standard on 3500 DRW is 11.5") with additional bolting between the carrier and ring gear, specially heat treated components and a finned aluminum cover for additional cooling:
GCWR = 39,100 lbs
GVWR = 14,000 lbs
Rear axle GAWR = 9,750 lbs
Trailer Tow Rating = 30,050 lbs
These ratings are SAE J2807 compliant.
We have no problem at all handling our 19,000 lb GVWR Mobile Suites with our Ram.

Rusty