2020 Ford F53

Loud thumping while turning was the symptom. The front chassis frame crossmember rivets were loose (Other marked above = chassis). The same area that the front leaf springs and steering were connected to the frame. This also cause the sector shaft in the steering box to get loose and have excessive play (over 1/4 inch). If this were to fail completely, the steering would no longer be functional causing a catastrophic failure and accident. The dealer did not diagnose the problem properly and tried to say it was the motorhome manufacturer who caused the problem. Please note that none of the parts involved in the fix for the problem had anything to do with the motorhome. When escalated to Ford customer service, they chose not to have the vehicle inspected by their corporate staff instead entirely relying on the mechanics initial assessment (Denial letter from Ford available as an additional file). When taken to another repair shop, they found the specific problem with the frame and steering box and fixed the problem. The owner of the shop noted he has had multiple identical issues with the F53 frame.