Ok, thanks all for the information, very helpful. But I think we sidetracked a bit... I completely understand how and why the inner skin is used. My thought is that I can now use a better product to keep the hull intact longterm. By using the inner skin behind cabinets, some walls, lower edge of bed, read end top piece etc. Then the rest use t and g wood, long pieces, fastened at every rib. Then on every rib where there is t and g I will have a band of painted steel that will not rust every 1' or 6" even fastened with olypmic rivets, so now we have screws at each point and a barrel like structure with rivets also put through. I cannot fathom how the inner skin would be stronger than this. I will also we be using painted copper penny panel for the whole top run of the inner skin, much stronger and just sweet looking. I will be creating a solid air barrier on the outer skin interior with relfectix and aluminum foil tape, then using 2 inch roxul insulation on the hull, 6 inch roxul on the underbelly, no reflectix as it won't do much from underneath. I am looking to passively heat and cool this airstream. Will have a couple new fans, wood stove. When all windows closed there will be no air leaks. I build homes and have roofed for years and I know the folly of making walls improperly, there are many new houses people ignorantly buy and will be rot in 5 to 10 years. The screws in the wood and the extra rivets are way more solid than the inner skin was period. How can it provide more structural integrity than my idea is my question? Thanks all, love the feedback!
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