I think I would trust someone with experience using spray foam in close to a 100 trailer restorations, whom is also a trained Architect, over HiJoeSilver's assertions, many of which are urban myths. I don't have time to deal with them, but spray foam is the best solution I have seen thus far, judging from my own experience using it in large building renovations. HiJoeSilver is quite over sure of himself in my opinion. Do your own research on the facts and take opinions on internet forums for what they are. Including my opinion in this.
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