Body thrust or body force to keep the car on the ground

I’ve made a topic about how I would be able to make a physicsless chassis, the main reason was so the car could drive on walls, drive upside down and gravity wouldn’t act on it as much. I think body forces or body thrust could help me here to apply force to the bottom of the car? Which one should I use (I think it may be body thrust) and how would I use it to achieve this goal?