Hi there, I am the new owner of a 2009 GL550 with 44k and am experiencing the same "wandering" that was the focus of your post from 2019. Just curious if you ever figured out what caused it and how to correct it. Otherwise it is a gorgeous vehicle but my wife is developing shoulder issues from constantly gripping the wheel in anticipation of getting jerked left or right when the front wheels hit any sort of rut. Any guidance would be greatly appreciated. Thank you. Ralph