just looking at it, looks like it will bind-up when flexed.
take a " W " the two bottom points connected to the frame, the 3 upper points connected to the axle. now try to imagine it flexing. it doesn't. well, with the bushings and a little pivot in the rod ends, it will flex some, but i doubt very much before it snaps that center bolt and blows the rod ends out of their sockets and maybe tears the tabs off the arms or axle tube.
maybe this was obviously stated earlier, but it has a ford bronco/f150 radius arm set up, that triangulation looks to just take the place of a panhard bar. it looks like they were trying to avoid the pitfalls of a panhard like having the axle move left or right from its up and down travel. good idea in an out of the box kind of way, but seems like it is trading one problem for another.
that single bolt will probably hold up fine.
the reason a single heim might be bad is that the joints need to pivot independently from one another.
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