They told me that they will set you up with their springs and install them for letting them use your truck for R&D. I am definitely down with that but my truck has a lot of kit on it now and they want trucks that are stock.
I called Eibach today, they said they are still looking for a RR for R&D. If anyone is in southern California here is the signup link https://eibach.com/vehicles-needed. I am not sure if OP has an update but Eibach support (Dave) told me they still needed one.
I also really enjoy the gorilla marketing they are doing on r/rangeraptor this acocunt sasquatchmebronco only posts about buckleupoffroad items its very obviously a ploy.