I have a 4.7 4x4. I slacked off on getting a full sized spare (5th tire) with original tire purchase, but now finally got one. I would like to put it into rotation where it will wear the quickest, thus eventually making it almost even tread depth with the other tires. I'm guessing my other tires are around 12/32, while the new tire will be 14/32. I'm guessing either position on the rear axle should wear quicker than the fronts? I'm assuming this because I believe more power is going to the rear in daily driving with the center diff unlocked.