I have recently used my GX for a few light tows over the past few months and I noticed that I have a shimmy at highway speeds when towing that isnt there otherwise. Yesterday I towed a hard sided trailer from home depot (5x8 single axle) and it had the shimmy even when it was empty. At first I thought it was the brake system on the car trailer dragging but the HD trailer wasnt plugged in at all and had the same issue. Any thoughts?