Originally Posted by thoer
There is a vertical steel post welded to the frame, with a flat steel plate and lug bolts. The spare tire is mounted onto those lug bolts.
Sorry Eric but the post isn't welded to the frame. As you can see in the posted photo the post has a flange that bolts to a heavy bracket that's welded to frame.
That's good for me because it can be unbolted and removed when I carry the spare in the back of the truck and allows the bikes to be closer to the rear of the trailers.