I fitted the JK J11369 version for the 71-72 van some years ago - fits well, works well, lasts well...the removable tow ball makes it easy to bolt on bike carriers or other tow plates - the tow bar is easy to remove/replace when there's an engine out job - works well with stock exhaust set up, dunno about other exhaust systems. only small minor problem when fitting was that one of the bolt holes did not quite align with the tapped screw hole in the vertical part of the chassis girder - just needed a little filing to make it work. also, I have not used the central upstanding tab on the tow bar which is meant to bolt into the rear valance member as this would have meant drilling new holes through the valance and it did not seem structurally necessary to do this anyway!
hope that helps
cheers
rob