I was thinking to have some sort of a vehicles blueprint that users can add or create to their games.
And the blueprint would include a default of 4 wheels that can be changed from 1 to 8 or more, to which would allow the user to create any type of vehicle, such as Cars; Bikes; Trucks; and more.
Users can also add option to change the speed of the vehicles, so they can make it slow or very fast.
Damage and Fuel systems would be entirely optional for the vehicle blueprint, though users can have to option to add them in their vehicles if they want to.