Suspect rear wheels misaligned. One tire developing a flat spot. This is 2nd set of tires. Rumbling sound from rear.
You need to have a four wheel alignment done. Keep in mind once the tires start to wear like you have they will continue to wear that way even after the align is done.
Tire wheel noise could be bad wheel bearig or loose or worn struts.
SOURCE: uneven rear tire wear
you need a 4 wheel alignment to check angles and see if can adjust or something bent
SOURCE: 2002 E320. Premature tire wear on right rear wheel.
THese cars have a high speed rated tire and will almost always wear quickly. The right rear is the drive wheel (where the power goes when you give it gas) It will wear real quickly if you drive it hard. I would try rotating every 7500 miles (unless tire sizes are different as with the SL series) I sell a lot of tires on these cars and 25K is usually the limit.
SOURCE: '03 Merc Mountaineer humming noise when turning
If same tires as before & air pressure set correctly, or as usual, a humming when swerving, or turning one way or the other or both, it's usually a pretty good indicator.
SOURCE: Uneven rear tire wear on 2005 Volvo S40
there may be a rear alignment issue but I'd check with a garage that can check your tracking
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