Tongue weight caused that. The bouncing up and down while hitting bumps driving down the high way puts stress on that joint tearing it like that. To repair it, you need to cut all of the crack out and just a little bit more. I know it is a pain, but removing the hitch will make the repair much easier to do. Once the crack is cut out, ( a small thin cut off wheel is ideal for this) it is best to put a V grove bevel in then cut line so that the weld has a wide base to add hear to. then just weld up the cut V grove. Then install a plate over that area and weld it in place for extra support. Here is a video on beveling. Keep in mind that what you want is to fill the crack with weld, and when you cut out all of the crack, you will have a gap in the metal where the crack was. This grove should be 3/32 of and inch wide, or about as big as a nickle turned on its side.
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