That is the one I use on my Ram hitch, works great. But some stingers will not allow this use, for the Andersen w/d setup on the FJ I use one of these Roadmaster universals http://www.etrailer.com/dept-pg-Hitc...ti~Rattle.aspx
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Jim
Sometime life gets in the way of living.......
That looks like a sound design for hollow ball mount shanks, although it does seem inconvenient to remove the ball mount, as it requires a wrench to remove or replace the bolt and the nut/spacer assembly needs to be properly positioned within the mount each time.