If it ain't broke, don't fix it. If the chain is tight and the tensioner is not at the end of it's travel, the timing chain is OK.
You might check the timing of the camshaft in relationship to the crank shaft. If it is not off by more than 3 degrees, the timing chain is OK.
If you start replacing parts just because you worry about them, the process will never end. The idea of a MB is that they last a long time, many miles and don't need a lot of parts replacement.
I also agree that the noise you hear is wheel related and nothing to do with the engine.
P E H