This may be a stupid question, but how do you plan to remove the trailer from the truck when it is loaded if the jack goes in the same hole as the lunette ring? 
Are you going to add another place on the side so that you can bring the jack along and jack from the side of the draw bar as well?
Are you going to add another place on the side so that you can bring the jack along and jack from the side of the draw bar as well?