If you want some help with this let me know. I've worked a lot with all kinds of networking stuff like UDP and use Godot regularly (though haven't done networking with it but it looks simple enough), don't know anything about SAMMI but the "Send UDP Packet" command looks about how I would expect

Accidentally had the day and night cycle sped up for this, but enjoy seeing the full thing 😅
I'm hoping to work on some new mechanics and a new location soon but this camera change was necessary for some of the things I want to try out.

Thinking through this now though I'm kind of interested in trying to use it more properly again for a real wheeled vehicle with what I learned making this hover car.
Like I'm kind of curious how even something as simple as having a down force may have helped it's stabilization and control

I ended up just using apply_central_force and apply_torque to add all the simulated forces I needed.
Mainly thruster and rotation input forces, air drag forces, down force, and some self straightening forces that try to align the cars facing and velocity direction

For a regular car, not really as I don't use the engine force or steering. I also found it kind of hard to work with.
I guess one tip is be careful with how things are placed in the scene wheel position and center of gravity can make a big difference. Try looking at some real cars center if gravity

The gritty details in a debugging HUD