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i didnt notice it till i uploaded this picture but i think it answered my question....they appear to be a setup called velvet ride. its supposed to make for a better ride unloaded...so now off to find replacements...
Hinged shackles were a trendy thing back in the late nineties or so, IIRC. There were lots of articles in 4x4 magazines. Note that articles in magazines are advertisements. Some posts on forums are also advertisements.
I think they wanted them to look like the suspension linkage in dirt bikes and make you think you got progressive spring rates by using them. They are probably useful in some limited way but mostly a gimmick.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.