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http://www.steelsoldiers.com/showthread.php?77618-TM-s-for-Trailers
And the &P has a lot of the measurements you need.
http://www.steelsoldiers.com/upload/trailer/TM9-2330-202-14&P.pdf
I can venture out today and get a measurement between the brake levers. But you'll need to build a custom...