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Yes, the endcap is steel, and the Argosy line was sort of a "test bed" for future features fo the Airstream line, so the build of the rest of the trailer may be pretty similar to what was being built at the time, or there may be test-bed stuff going on that makes it different.
Much more important than how it was built, is how it has been maintained. The trailer is, after all, 50+ years old, and if it has been parked in high wet grass for the last 20 years, the frame is probably rusting away and will require extensive repairs. It is not easy to inspect a frame, as it is enclosed by the belly pan, so you need to learn about identifying rear-end separation, and all the other means of deducing that the frame has troubles.
good luck!
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