Add more spare selectable wheels for the rear end. It just looks strange with the stock one or event none
An alternative option would be a covered spare wheel, so it would'nt be so obvious that it's different?
The hub system doesn't work with the spare wheels as the hub system creates fw (front) and rw (rear) wheels nodes. Therefore they would have to create new jbeams for all wheels for the spare tire hub system. Kinda the same as if you would want to create a 6x6 vehicle, you must create new wheel jbeams for the other rear axle or otherwise both rear axles try to connect to both wheels and the axle breaks. Creating a new spare tire is fairly easy, as you only have to change the mesh name in the jbeam if you want to do it the easy way.
