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Reflective bubble insulation under 9mm ply
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
We made sure to cover every square inch possible with reflectix first, and R19 anywhere else we could.
DIY magnetic reflectix covers
Rear fold out windows. Flippable window covers made from carpet, batting insulation and reflectix.