Thanks for the info. I will be taking the coach into have the rear tires&wheels balanced while on the vehicle next week. They will also check the run-out, u-joints, and shocks. The shocks should be o.k. as they are Bilsteins with only 40K miles. This shop cannot check the drive shaft balance so if I still have a problem will have to find a place that can check that.
Thanks again,
Doug T.