Do a search for Zepplinium (he's one of the forum members) and Insulation. A couple of years ago he did some rather detailed tests of different insulation products in a highly controlled environment.
FWIW I used Prodex and closed cell foam sheets in combination.
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Craig and Carol
1997 34' Excella 1000
1970 27' Overlander, International
2009 Ford F150 5.4L
ProPride hitch with 1400# bars
AIR 41028
TAC GA-8
WBCCI 10199
Past President Southeastern Camping Unit (12)
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