The army jeep is a very simple car but it is made to overcome the toughest tests. The free movement of the wheels simulates a suspension with a fairly wide travel, it is a very fun toy. See it in action in this video: https://www.youtube.com/watch?v=4-7D3qtwjcg

No supports required, just make sure you have good adhesion to the bed. The front bumper and gear stick have a small brim that you will need to remove. The steering wheel and the gear stick are easily embedded in the car, you can glue them if you want.