Hello from Colorado: Welcome to the vintage Airstream hobby. I'm working on a 75 Overlander 27' trailer myself. It had some frame issues also.
My trailer isn't gutted. I did drop the belly pan from the axles back and did a thorough inspection. My trailer had a mild case of rear end separation due to rear subfloor rot which is common in these seventies trailers.
I hired a local "mobile welder" to come to my place and make the necessary repairs. It took 3 hours and $400. He repaired one outrigger, one broken crossmember, welded in a new rear crossmember, welded reinforcements to the street side frame rail, welded on new rear frame "skid rails" and welded in new holding tank supports for me. The frame is now stout and the rear end separation and sag are gone.
Be sure to inspect your frame carefully, especially for axle plate cracks and frame cracks or buckling behind the axle plates. Inspect for weakened steel due to rust. Don't fear welding. It is the best repair method. I wish I had developed my welding skills.
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 !
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