RE: A, B, or C.
Separation is really not a problem anymore, so that throws that reason out.
The reason why I suggested D, and nothing else, is this.
Note the wear patterns of the lugs.
Go run your hand across the top of the tires, and you'll see what I mean.
One edge of the lugs will be "sharp" and the other "dull".
That's because the front tires wear under braking, and the rears will wear under acceleration.
If you rotate across corners, front to rear, you continually wear the tread in the same direction.
You could, especially with an open diff in the rear, rotate the rears side to side on occasion,
to help with the right side tire wear, since it will
do most of the work.
Hope this helps, been wanting to put a pic up of how the tread wears differently on front and rear tires. [img]images/graemlins/wink.gif[/img]