I saw your question regarding a rear hitch on your Airstream. Did you ever install it?
I am not an engineer or physicist, but it seems to me if you could run a channel inside the existing frame to the wheels or past it should enhance the structure, add weight sure, but in the 22 to 25 ' range with dual axles, I can't see the problem.
Just curious, I am a firm believer that there is always a solution to any problem.
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