Just my .02 since I started mock-up of mine today. I will be using the stock tow hook brackets and fabbing up a hitch between them. I have them tacked. I'll probably start a thread so I don't clutter up James'. It will look/function almost the same as his, but uses all 8 of the mounting holes. I also need my tow hooks for dyno tie-downs.
My bike trailer is 2k max, so I will be only using a class 1&2 1.25" receiver instead of the 2" square that James did. It'll be plenty for the 2-300lb tongue weight of that class.
I will also either tie it into a light weight crash beam/bumper support, or just support the lower edge of the bumper like the factory crash beam does.