Look around for pieces to a roof rack, all you really need is the piece that goes over the windshield and the piece that goes across the back of the Jeep (most either bolt to the bumper or bolt directly to the Jeep rear corners). Having those two will let you use your soft top still, and spreads out the weight more, which is sooo much better feeling if you have a long board. Have seen people make the pieces out of wood lol, not sure how much I'd trust it
But it can be done! Or have someone weld them together for you?