Hello: I should think you will be removing the entire old vent/fan assembly so the new AC will fit through the whole. The AC takes a dedicated 20 amp circuit from the breaker box to the AC. I bet you 66 has that wire already run up there, and maybe you have found it.
Here is a photo of the factory installed wire rolled up on the top right of the breaker box. My 66 Trade Wind had a separate breaker for the AC, but I don't know how the wire was run. I never took the AC off.
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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