Re: rotating tyres
If they're directional, which they most likely are, you'll only be able to rotate them on the same side. If you move them diagonally the direction of rotation will change.
Once a wheel is balanced it doesn't matter where it is on the car as the balancing is done off the car. An unbalanced wheel will have a far more pronounced effect when on the front of the car, so it may be that the wheels on the rear are slightly unbalanced but you won;t notice until you put them on the front.
Another thing to watch out for is that if the tyres are worn past a certain point it's a bad idea to rotate them, they wear differently on the front to the rear and moving worn rear tyres to the front can cause problems due to far less of the tyre surface actually being in contact with the road.
Hope this helps.
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