One I've made myself that is a very compact design.
This one use's a serie's of minimal suspension blocks as the actual suspension, suspension cords to support them with different tenseness's, and some slider's which give it the extra suspension like to a real car benefit.
The controls are minimal as it's only made to be as a design to show off how compact a suspension chassis can be made for cars.
Up Arrow - Forward
Down Arrow - Reverse
Left - Turn Left
Right Arrow - Turn Right
Q - Tense's the Suspension for rigid movement (Toggle)
This is a prototype and may be modified to a better form in future.