I don't know the answer to any of your questions because I myself only found out through this forum that Mercedes alignment
has to be done with the use of a spreader bar. I do not know how
that is done.
I've been driving different Mercedes for many years and didn't realize that the alignment shops that I was going to weren't doing a good job.
Maybe some of the pros can answer the questions.
Sorry I do not want to make any guesses.
1992 300 TE (M103) 113.7K miles