This may be a basic question but when I get my sonata limited up to around 70-80 mph on the highway cruising it vibrates quite a bit. Idk if passengers can tell but I sure can. Just to get a diagnosis they wanna charge me $150 which is crazy. I figured the only things I can imagine it being is wheel balance, tire pressure? Or maybe suspension? The wheels were put on around 7k miles ago so I’m assuming they should be balanced right but I could be wrong. Would anyone have any good suggestions or ideas?