The steering play may be just tie rod ends needing replacement. Super easy and low $.

For the rear clunk, sway bar end links would be the first thing to check. Another easy, low$ repair.

A good idea, and well worth the $, taking it to an independent shop that works on a lot of MB's for a pre-purchase inspection. Most should charge 1-2 hrs. labor max.

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Sam

84 300SD 350K+ miles ( Blue Belle )