The axle spacing is the problem on the 2020 Astoria 3173 fifth wheel , causing it to sway even with no wind Its a problem the Dutchman factory knows about but kept it quiet. The 2021 Astoria 3173 has the axles moved back eleven inches from the 2020 model to stop the say. Its a blatant defect in the 2020 model that cannot be fixed as the 2021 model has everything changed due to the axle spacing change. The wheel photo shows the difference. The pen represents the 2020 wheel center, the wheel is the 3021 wheel NHTSA WILL BE INVESTIGATING THE PROBLEM. User's recommendation: Stay away from buying the 2020 model 3173 you will be liable in case of an accident..