I could hint one problem for sure. There was this bug where if you scale down your model to 0, the default 3D Rad fish would pop up. I needed to find workaround solutions to fix this. One of them being to hide the model when the scale is below 0.05.
For tire specific bugs? I really don't know... What could possibly go wrong with 3D Rad?
So looking at the skinmesh tire it looks pretty normal BUUT .
#1 issue : there's no brake calipers, Only the rotor. #2 : there's no studs to attach the tire too ( the holes are empty even when attached ) #3 : There's no lug nuts either ...
All in all, a 3drad car is very dangerous to drive, and the tires should fall off before even moving !. 😱
As to one of your issue's @drninkeo Yeah 3drad still suffers that alignment issue, but it's avoidable if you follow this process ...
1: [SHIFT] RMB Click the tire your working on to select its center point. 2: Use menu > EDIT > Move object to cursor aligned. 3: Click the skinmesh tire to move / align it perfectly to the selected car wheel. 4: Connect the skinmesh to the car in the list editor (check box's). 5: Repeat for all tire / skinmesh's. 6: A tip here, setup one car and save it as a resource, then you can merge this back to your project as many times as needed to save a ton of alignment work if using multiple vehicles.