My 2010 Yukon SLT has 20" wheels with almost new tires and has no swaying or bouncing issues, but I get the most harsh bumpy feedback through the steering wheel. This my 28th Tahoe/Yukon and I've NEVER had one that you felt every little bump so bad in. The tire place had left it with 38psi and I have lowered it to 30psi to help it some, but it's still very noticeable...Ball Joints, sway bar bushings, or ? what do you guys think?