Smarty's Wheel Pack v1.2.1

* Added super single trailer wheels; Contact me for instructions on including them in your trailer mod
* Improvements to reflection quality on Alcoa 12.25x8.25 model
* Improvement to seams on X Works XDY tread surface
* Rear hub now has paintable attribute and drastically improved appearance
* Addition of polished and chrome looks to front and rear wheels, plus pre-1999  Alcoa logo option
* Collision radii have been revised to better reflect real world rolling radii
* Many more appearance tweaks/improvements