Hello from Colorado and welcome to these Airstream Forums. There are lots of folks here who enjoy the vintage Airstream hobby, including me.
I'm afraid I don't understand your question. A photo sure would help. I believe your Safari was fitted with the leaf spring and shackle axles of years past. About
1961 Airstream switched to the Henschen "Dura Torque" axles which eliminates the maintenance problems with leaf springs and shackles. Here is a photo of the dura torque axle, now Dexter made Torque Flex. It is a great performing axle. I installed these new axles on my
1966 Trade Wind renovation project.
So I think maybe you have leaf springs that have taken a set, or maybe some flex in the body mounts causing the unlevel condition. I can't imagine an axle "spinning" in its mounts.
Others with similar vintage trailers will likely chime in, as many folks here know I have no idea what I'm talking about.
David
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WBCCI #8607 VAC Region 11
KnowledgeBase trailer renovation threads: 69 Globetrotter, 76 Sovereign, 75 Overlander, 66 Trade Wind Such fun !