Need another picture
For towing, it really doesn't matter how the back section of the frame looks. If you think about the dynamics of towing, stresses start at the coupler and end at the axles.
Airstreams are of a uni-body design; the shell & frame work together. Believe it or not, the shell is stiffer than the frame. The aft frame is there to support your stuff, and there does not appear to be any stuff in your Airstream. If the C-channels forward of the axle are in reasonable shape, towing is possible.
Obviously, reattach or remove the belly skin. Foremost for the people behind you, but that skin ain't cheap either.
Towing on a flatbed trailer sounds good, but all the vibration and wind dynamics of a trip from AL to CA will still be there. Plus, if the Airstream's forward frame survives being winched onto a trailer, it is probably strong enough to be towed.
I say, "Inspect your forward C-channels, tires, bearings, coupler, belly skin, and lights and proceed accordingly".
Tom
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