What is Winnebago's recommended tire inflation for your Motorhome? If you're not sure, you'll find the manufacturer's optimum or recommended tire pressure for your MH on the sticker on the drivers side door, or if no door, on the wall below the drivers side window.
If this is different than the 80 lbs indicated by Goodyear, I would reset your tires to the door sticker specs and see if this solves your issue.
Also, I noted that you set your tires to the same 80 lbs all around which i suspect is part of your issue. With the two Winnebago MH's we've owned, the rear tire pressure has been less than the fronts. In our current 38 ft Suncruiser, the Front tires are 100 lbs, the rear are 90 lbs. It drives perfectly when the pressures are set to Winnebago's recommendations.
