Congrats on the new tow beast!!!
Even though it is about the same tow rating as the 1500, the 6.0 definitely does a great job, and just about points at every gas station as you roll by as well!!! Lol It is a thirsty motor, but plenty of power, especially with the 6spd trans.
The big advantage you now have over the 1500 is the payload capacity of the truck!!! Not sure of the exact combo you had, but the 1500 was probably in the range of 1700lbs or so for the payload. I would guess your new truck is around 2500lbs or so per the yellow sticker in the drivers door jamb.
We have been happy with our '13 Chevy. It is now earning it's keep with our new trailer! Our Jayco is about 2k lbs heavier than the last trailer. Does a good job!