Well my character can possess the vehicle. So that’s the first event I’ve added - switch character controls to vehicle (event on the server).
Basically, you can create a new map, put 2 vehicles and they are already replicated (movement, rotation).
I suggest you to remove all pins from event tick and start adding custom events. I suppose that no one wants to affect the “health” of the server with event ticks. Specially when there are more than one vehicle.
Howerver, this vehicle system is good, but it’s mainly for single player. If you want MP, than you must remove all event ticks and create custom or timed events that fires on the server (nitro, damage system, morph mesh, siren, lights etc). Also, do not use line trace in tick to checks if vehicle is on the ground. There are other solutions for this.
What I noticed about this vehicle system: mesh morph is flickering, vehicle can easily sink into landscape (tested with 10 hits: vehicle 3 times sinked), it uses some keyboard events in ticks (I highly recommend you to replace this).
After that, you can replace sounds with sound cue with attenuation, so sounds will also works in MP. And then your vehicle is ready for MP.