Fantastic discussion. Haven't been on this board in ages. I, too, have suspension issues with my 2009 RRS HSE. 138k miles. At higher speeds, the tail end of my truck 'shifts' to the right when going over bumps. It's intensified when I'm going around high(er) speed curves. Not very safe, to say the least. I have a diagnostic tool from AB (A MUST) and the readings are pretty extensive. Take a look at the attachments if interested. Debating on where to start. Just had the air compressor replaced last year. Any thoughts/suggestions appreciated!