a 4 wheel alignment might be just as effective

we just had one on the X3 with 24K miles, $149 from our stealer
the rear tires are cupping on the inside and make a L O T of noise

the only non paved driving we've done was on some logging roads in Oregon 100 miles

the rear was pretty bad, right front needed a little, left front was ok

I DO swap tires from side to side on my 91 300ZX TT, it has 145K miles and needs new springs