Cool truck! Did you make it yourself? [stupid question, your website says you have done 3d-modelling before ;) ]
No question is stupid :# ! I can make a truck like that, but it would take me lots of time. I've modified an existing model. There are lots of CC-0 3D models in BlendSwap and Sketchfab, just to name a few. The model I've used is this one: https://www.blendswap.com/blend/20912
I simplified it, remade most of it and switched the tires. Anyway, I'll place this link in the credits portion of the game.
I see you have drifting mechanics. How did you achieve that? I'm still using VehicleBody though.
I didn't actually tried to make drifting mechanics. It worked this way when I made a RWD vehicle with my setup. It was actually quite realistic, and actually not much fun, because it was too hard to turn, and when accelerating, it was too unstable.
I think the key for drifting is to not have too much grip (or friction in case of Godot's physics material or FRICTION SLIP in case of VEHICLE WHEEL node), so that, once you achieve a certain speed, if you turn, your vehicle won't topple over, instead, it will slide. Of course this will work when combined with the friction of the ground material.