I figured I would still need the WD hitch, I already have one, it's the cheap Husky with friction sway control. I just went for a nice little ride to test it out after adjusting the WD height because the 2500 is a little higher than the 1500 was. The truck only sank one inch measured at the wheel well but I did see the front come up a bit, so I put the bars on and didn't tighten them too much, I used the third link and had two hanging. It bounced a little but I think that's to be expected having preloaded bars pushing back up after it goes down.
The new truck did great but I didn't want to push it too far having only 90 miles on it, on the back roads heading to the highway you really couldn't tell the TT weighs 9000+lbs, plenty of power with the 6.0, no noticeable bounce or sway. The highway was where the bounce was noticeable but it wasn't bad at all.
My 2010 1500 with the 6.2 got 7.7 mpg, this test with the 2500 and a 6.0 was getting 9.4 but it's not broken in yet so hopefully it will stay at that or even better later on.
I appreciate everyone's info, it helped a lot.