hmmmm . . .
A rear view mirror, and a right side mirror, and a 5 window cab, might have helped your right side view, but they were all options/accessories.
How would placing the side-mount spare on the right side of the bed have risked blocking the view on the right side of most trucks?
And, I do not think that the spare on the right side would have blocked the view on the right side when looking out the rear window?
By the way, this same question gets asked (and, is unanswered) on old Ford truck discussion boards.
