Hi there. I don't quite understand how are you using this clamp above in the photo. Could you please download some pictures so I could visualize it (if is possible).Years ago I discovered a trailer ball in the under-belly drawbar doesn't work so good. When making a turn the rear tires will hit the trailer tongue rather quickly.
I can mount a trailer ball on my 3-pt hitch drawbar and gain about 18" back from the under-belly drawbar. This allows much sharper turns.
To keep the 3-pt drawbar level, I made a 12" long section of angle iron with a bolt hole in one end and a muffler clamp on the other end to hole the angle iron to the lift arm.
View attachment 1773480
Thank you kindly.