All credits to BYardley

In the original post, I criticized the author for not making a suspension for such a beautiful car. He said it was too hard due to the car's low ride height. So here is my attempt to make the suspension for this car.

The biggest issue for this car is the Unity engine itself. Scraping the ground is normal for cars with this ride height but in Simpleplanes, the physics engine may decide that your car should be a plane instead (it's a plane game after all). Therefore, I could not push the ride height as low as I wished. I also cannot push as hard as I can on race tracks due to the chance of the car being launched into the air.

You may say how about increasing the stiffness of the suspension components? I find it impossible due to the scaling of suspension components. When the hinge rotators are shrunken and have their mass reduced, the joints become flexible. In this case, even solid links will appear springly. What makes matters worse is that any bumps can send the car flying due to Unity physics. Therefore, I struck a compromise with a relatively soft suspension.

Hope you enjoy!