Look at my hitch set up please....

Even with the top mount coupler, round bar hitches require a lot of ground clearance. I would ditch the round bar and get a trunnion hitch. This way is much less intrusive and doesn`t require any modification to the trailer. even my trailer with a top mount coupler and a Reese Dual Cam trunnion hitch still has minimal ground clearance. I could not run round bars even if I wanted too!