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When I saw the location her was heading, Oregon, the first thing that comes to mind is windsurfing "the gorge". So maybe it's the mast for his windsurfing rig. It's a high wind location that windsurfers go to that is the best in the country, that I'm aware of. Although there's no room in his car for the board unless it's on the other side, a very short board inside or already at the location.