IF you change the boxes for the wheels make sure they don't reach the ground. It will make it impossible for the com to go up curbs and steep mounds. Have it so that the box is as close to the ground like it is now.
Actual result will be that the CV clanks into the floor when it drives over a bump because the suspension is going higher than the hull hitbox. There's a reason wheels are non-solid.
when u hide your NF CV in a VF u can only get out through the "front door" by going trough the non solid tires.
So the Source engine has vehicles, but the tires must never be solid or they will collide with the ground? Yeah Valve, that makes sense. Ok, they will tell me collision boxes are very simple and driving on a rectangular wheel would be a little bumpy. I have a question to the modellers here: Is it possible to attach a collision box to the wheels directly instead of the chassis? That way they would move with the suspension.
I would assume you don't need to give the wheels a hitbox because the wheels and their collision are simulated by the code. The wheels use a soft collision that's simpler, smoother and more flexible than the rigid collision used by hitboxes, and possibly uses a virtualized 'perfect' cylinder (or a sphere) rather than a finite-sided prism. (Hence why, if as a player you run into a vehicle's wheels it pushes you away rather than simply stopping you as a solid object.)