Wow, I am no expert on RV wall construction but, aluminum caged walls do transmit the heat and cold, I don’t know if the sweat inside the tube but I have seen frost form on some interior walls in places where air circulation wasn’t good and obviously the insulation was poor where the metal studs were…. Aluminum caged trailers also fail other ways… they crack and break and oxidize…
Laminated constructed walls get much of their strength form the lamination not the cage and only have the metal studs where they think they need them, to me that doesn’t even sound like construction for the long haul…
One of the reasons I got rid of my Sunnybrook, a built up constructed aluminum caged trailer was because of repeated structural failures, and repeated trips to the manufacture for structural repairs…
Wood frame construction has been used for many years successfully, it is the tried and true... any construction done well from the factory and well maintained will last for many years… most RV’s with few exceptions have plenty of wood products in them that can rot, mildew, and mold…
Replacing roofs can be expensive but cheap compared to repairing some of the walls used today… repairing the floor is hard in any type of trailer…