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Now the New Keystone Alpines state R40+ floor, R11 sidewalls, R28 ceiling. Lets see R40+ Alpine floor compared to the R21 Montana floor that is pretty well double, why?
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Darwin & Maureen DeBackere
Minnedosa, Manitoba, Canada
2011/3500/Silverado/4x4/DRW/Duramax 
2017/3721RL/Legacy Pkg./Pressure-Pro 
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