I recently installed an RTT and a 270 awning on my LX570? When driving, if I let off the gas between 50-60 MPH, I could hear and feel a distinct whine. It felt like it was from the steering column, but it could have been from the AHC. I recently took the awning and tent off to store for the winter, and the whine went away. Has anyone experienced something similar? The AHC has all of the original globes. They have been inspected several times, but they still appear to be in good condition. I have 188k miles on the rig. TIA.