Hi everyone,
Sorry to be late on thread, and for the pain you’ve been having, though it’s cool to see everyone helping out 
I wanted to mention that in 4.3 you will no longer need to explicitly set the tires to Kinematic (though leaving it as is will still work). In 4.3 a vehicle with default wheels will automatically be fixed up when it gets instantiated so it eliminates one of the steps required for vehicles.
We’re still looking to improve whole process so if you have any suggestions for vehicle specific work flow please let me know it’s great to get all feedback and see what people are having issues with.