I bought this adjustable ball mount to make a weight bracket for some Olympic size weight plates I have. It is $39.99 at Lowes.
I used 1/2 inch threaded rod and a steel fence post for the materials. I then used 1/2 inch washers that were a nice tight fit inside the steel fence post material to keep it centered around the 1/2 inch steel rod.
It took about an hour to cut the pieces and find the right assembly etc...
In hindsight I made it too long and will take 4-5 inches off the length of the bar.
And for the other piece that came with the adjustable ball mount kit I can use a large suitcase weight on that. I will likely modify it so I can put 4 - 6 suitcase weights on it though.
What do you guys think? Should work well with the 2" receiver mount I have on the way from Scott.