I'm at 17k miles on a 2018 GLS 550, had a puncture in one of my rear tires. While i was getting that repaired, I really looked at my fronts and while the outside tread is fine, i'm almost to the cords on the inner edge. I obviously need to get an alignment, is that something only the dealer can do on these with the air suspension, or can I take it anywhere to get it aligned? I'm assuming the dealer only does it to factory specs which may cause the inside edge tire wear?