That lighting issue with the wheels is so weird. Are all of your cars exported from the same software?
I also think that suspension raising is a bug, unless there is a default property we are missing like i did with center of mass offset. Hope jumps in to enlighten us.
Btw, have you noticed something like this > my car is rear wheel drive. When i accelerate and then release the key the car starts to slow down but rear wheels start to rotate a lot slower(or faster) than they should be while the front wheels rotate and stop as expected. I tried this both on a box surface like your setup and a terrain and got the same result but strangely it gets fixed on a landscape that i scaled up after creation. I dont know if it is my vehicle settings or not so i’m not calling this one a bug for now. I should test it out with the sedan sometime.