I have seen them
Chris, about a year or two ago, I thought about trying some on my taco. Even contacted Tera Flex about an application. At that time they told me that they did not have any actual application for our Toyotas "but would be very interested if I decided to Beta test them for them"
I then met a guy with some on a jeep. So I really picked his brain about them. He told me that at the time he was really having a rough time with them binding on him where he would extend them but they would not fall back into aliegnment when relaxed. They would also go beyond full extention on him and instead of folding back up properly, they would fold up in the opposite direction forcing him to flex out his suspension totally and manually forcing them back into proper aliegnment.
I have always wanted a "Door hinge" type shackle. The idea is not unique and has been around for awhile. I had Outback offroad in San Antonio lined up to build some for my swap. Carl there has a "house" model he builds all the time. But they are pricey. $3-$400 for a set.
I have some ideas for my own version if you care to email me about them. I have tried to simplify the design and I think I have finally come up with a good design I plan to implement into my swap.
Like I said email me if you care to further discuss this idea, you still have my email don't you? if not I just emailed Barb for some parts so she should have it.