In addition to dimensions and the weight capacity of the axles ....
You might look to see if the axles are welded in.
Airstream switched over from leaf spring axles to torsion axles in 61 or 62.
For a short time after the switchover Airstream welded the axle to the vehicle.
That did not last long, and they changed to bolting in axles.
Even if the axle is bolted in, NOW would be the time to spray with penetrating oil.
1966 Mercury Park Lane 4 DR Breezeway 410 4V, C-6, 2.80 - Streamless.
1966 Lincoln 4 door Convertible 462 4V 1971 Ford LTD Convertible 429 4V Phoenix ~ Yeah it's hot however it's a dry heat!