I've finally managed to make a stable, yet high travel suspension design with maximum wheel articulation.
https://www.simpleplanes.com/a/74m8vz/4-Link-Cliffhanger-Chassis
This is free to use as I want more people to start using proper suspension instead of sticking wheels on shocks and saying it's an off-roader.
This suspension system can even be converted to anything from rockcrawler to truck to street car.
Contact me if you want to make use of this design or any of my other suspension systems.