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See my youtube... Airgapped reflectix closest to van metal, then spray foamed foamular, cavities filled in with polyester fiber, floor has radiant barrier with air gap too, I made a video on it
Reflective bubble insulation under 9mm ply
We made sure to cover every square inch possible with reflectix first, and R19 anywhere else we could.
Rear fold out windows. Flippable window covers made from carpet, batting insulation and reflectix.
DIY magnetic reflectix covers