As far as I can tell the arctic insulation package is just the heat reflective astro-foil layer in the underbelly. The construction diagram in teh product manual shows a double cross to indicate the AIP items and the only item I can see with the double cross is the astro-foil. I wouldn't imagine that the AIP helps in the heat of the summer if it is in the belly. It really will help in the cold though. But, there a re a lot of gaps in the underbelly that must be sealed for the added insulation to really help. It would be a good idea of Montana to put the astro-foil insulation in the roof (and sidewalls).
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