My Jeep has a TrailFX roof rack, got an F350 too. No issues. Finished the poles today, put 3/8 steel pin in the top of each upright that goes through the metal grommet in each peak peak of the canvas. Ridgepole is 2" poplar dowel that is drilled to slide over the pins before they go through the canvas. I put rubber washers on too that help seal it all up. All good and very sturdy.