Having the proper hitch

I am about to get a 35ft.TT so I'm checking into what to get as far
as the correct hitch for the trailer. I am looking at a TT with
a tongue weight of 1150lbs.empty. I have a hitch that came with
my truck, the sticker says 15000lbs with a wdh and 1500lbs tw.
My question is, does the wdh take away some of the tonque weight.
If it didn't I will be close or over the tongue weight and would need a heavier hitch. Any comment on the proper wdh and sway is appreciated. As far as the truck I'm not to worried it is a 3/4 ton duramax.

Use 13 percent of the trailer's GVWR for an approximate tongue weight. You never tow empty so that tongue weight number is essentially meaningless. Also, your discussion is more about the truck's receiver rather than the hitch that will connect the truck with the trailer.