I believe he has the "max tow package" which consists of:
The Max Trailer Tow Package consists of a 4-pin/7-pin wiring harness, Class IV
receiver hitch, 3.55 electronically locking rear differential, 36-gallon fuel tank, auxiliary transmission and engine oil coolers, an integrated trailer brake controller, and an upgraded front stabilizer bar.
I believe the added weight will likely reduce the OP's payload. James, what is the payload capacity for your 1/2 ton? A payload placard looks like this and is in the driver door frame: