You may try taking your car to the dealer for an alignment. I've posted questions regarding different tire problems, as well, and was told that Hunter alignment machines are used at the dealer because Hunter works with MB on the machines.
I had my car aligned previously at a regular tire shop, and it only took them 30 minutes.
I talked to the dealer today and made an appointment for tomorrow - they said they use special tools to perform the alignment, they align all four wheels, it takes 2 1/2 hours, and they charge $95.00.
You can't go wrong by going to the dealer.
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".