brulaz wrote:
12000 - 7300 = 4700# is the tow capacity with a fully loaded truck.
You are implying tongue weight is added twice. TW will (mostly) go towards TV GVWR which assuming puts the TV at GVWR may mean there is 4700 pounds of TT axle weight remaining. Under 5k dry should be fine in order to meet GCWR. Keep in mind the non hybrid 6.0L equipped vehicles GCWR is 16k-20k pounds.
Pay attention to the payload as equipped per tire and loading sticker. I saw one hybrid SWB GM SUV at a dump station towing a TT in the last 4 summers of RVing. The rear end of the TV was sagging a lot. It looked bad. The TT was in my estimation too much weight, but he may also have the WDH improperly adjusted.