This occurs on US 81 through South Dakota. Every time I drive that highway. The first time it occurred I was so concerned by it that I rebuilt the rear spring pack and new shocks all the way around. Then I went to the scale to ensure I had everything set correctly. Now that I have that information I know it is the road and there is little to nothing I can do about it. I have found since the suspension work and readjustments for weight that it isn't nearly as bad as it was and I can either slow down or speed up slightly to get it to a tolerable level. I have considered adding shocks to the TT because ours has leaf spring suspension. Might help with movement inside while camping.
