It's towing capacity came out at 12600.
How that is determined needs to be broken out.
Glad you found a truck you like. Your eventual hitch rigging formula work will require a truck "empty" weight as a baseline: Full fuel, driver and anything permanently kept in the TV. A certified printout from a CAT Scale out on IH-25 will suffice, showing Steer Axle & Drive Axle weights.
The Dodge Towing Guide
will show the "factory" empty weight total and per axle division, that, along with your new scale reading will show how much weight needs to be "replaced" on the Steer Axle once the TT is hooked up. The difference between published and actual is generally hundreds of pounds. About $10 per reading, with a $2 re-weigh fee as necessary. I usually fill the fuel tank at the truckstop, and then proceed to the scale.
Show us the Dodge figures for your truck spec, and the actual "empty" axle weights, and we can zero in on payload capacity
. Proper hitch rigging will maximize payload available. The goal is fingertip control once hitch adjustments are made, which can only be analyzed and dialled in with weigh scale numbers.