Zero rubbing. Though I have not had the opportunity to fully flex on a hard trail.
Correct me if I'm wrong, but I thought that a lower offset equals more poke and less suspension interference. That said, a 4.50 or 4.75 will have less of a chance of interference than say a 5.
Something like this:
And get a basic D-ring receiver hitch thingy from a local hardware or auto parts store.
JM rigging is awesome. Slow shipping but worth the wait.