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This is called a boom stand, and is used as a support for the arm of equipment that is being transported on a trailer like a lowboy. I designed it with small catch 'feet' on the front of the legs that can help hold it in place, and it is set at a scale 3 feet wide so it should sit on most lowboy crossbars between the rear wheels, or on the rear decking. The arm itself can be raised or lowered, and I'd suggest a small hole drilled in the middle with a small diameter metal pin in place to hold it up, or simply glue it in place. Should there be any questions or concerns, contact me via the designer link or direct via email to email@example.com