I would fight the tire issue first, my neighbor had same issue after purchasing new tires for his F150. Long story short, his tires would only stay balanced for about 50 miles then shake like hell. Multiple trips and fights later, he has new set on his truck. No issues.

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'03 Black BMW E53 3.0i 110,000+ miles
'03 Black Mercedes-Benz W211 125,000+ miles
'13 White Mercedes-Benz W2o4 New