Thanks, well from what iv'e learned. Never put wheels on a prop that has little mass, that's way we see so many dupe cars that sag on the ground because they put the wheels on something that doesn't weigh a lot. Sadly i don't know of any wooden parts that have high mass. And same goes for plastic sadly. Metal i think is the best way to go, but yes i see what you're saying you want an all wooden car. Maybe you could try a larger single wooden piece and put wheels on it and build off of that, that might work.

Thank you for your advice but i wanted to build vanilla destroyable car. Metal axles are solution for that problem but they destroy my concept. If you have more idea how to fix I can try it.

This is cool, but the wheels like to slouch, a way to fix that is to use metal axles on the wheels vs plastic or wood.