I was looking at my Titan yesterday and noticed that the big tow mirrors are angled differently. The passenger side is angled further back than the drivers side mirror. Both are locked into place but the angle is definitely different. Look at yours directly from the front and let me know if this is the case with yours. The only explanation I can think of is that Nissan purposely does this as the tighter angle on the passenger side mirror angles it closer to the driver thereby reducing the amount of adjustment you need....simply because the driver is sitting on the opposite side from that mirror. Does this make any sense?