The hooks on my 3,000# gross cargo trailer were too small to fit over the plate, so I went to Northern Tool and bought 2 large D-rings. These are rated at 12,000# sheer strength each. Should hold back my trailer if the ball mount fails... LOL
I went with these, because I believe the plate is an integral part of the hitch strength at the receiver tube and these should fill the gap I cut out of the plate. I don't use the Plasma cutter much, but it sure is nice for a job like this. Took longer to hook it up than to cut out the plugs. I think I got enough weld on them to feel confidant they won't fall off...

I like the way this looks more "traditional" too.
I now need to get out my portable siphon blaster and clean up the welds for paint.