The rear end got knocked out of alignment on my V70R (the dealer said that it was because I tow a small trailer?!) and as a result the Pirellis are cupped. I had the car realigned but now the tires are making too much racket. I want to replace the tires but not neccesarily with the same Pirellis. Can I put a different brand tire on the rear w/ harming the AWD system? Also has anybody had any problems with towing a trailer with their V70R?