That is some very innovative thinking. Every time I think of something someone always critiques it in a way that is not what I want to hear. Now I'm doing it.
There are kits to install the more modern bar links to the tailgate or DIY from a donor. I think if I did anything, I would do that or the uber modern sheathed cable.
Your "S" hook and magnet idea would be great for the above.
I do say the no damage installation is a big plus.
When you lift the tailgate some in order to hook the final side or when you are closing it, and you lift too far, would the opposite link pair unlatch and fall?
If you send an email to Classic Trucks Mag or other mags, they may ask for an article. I did that and it got published. You fill out a few forms, submit it in the way and format they want and they pay you. I suggest a cool website and social media exposure also. Mine was an idea that anyone could do. They like reader ideas. Not sure if you approach it like a product it would be welcomed without purchasing ad space or something. Be careful there. I don't think I have never seen these mags showing an install on a product that the supplier was not an advertiser. Not sure about that.
