bagged dually
+1y
Go check out C.K. Custom's build thread. I think it's titled "Here we go" on page 3. He copied a design that Guilty by design came up with if I'm not mistaken. It's supposed to be pretty stout, it looks pretty sick for a goose neck setup, and isn't overly complicated to build.
If you want something even stronger I'll try to get you a pic of a setup we just welded in my little bro truck. We basically just got a huge,heavy ass plate of 3/4" steel that runs the entire length of his notch and welded and gusseted it in.