http://www.spacecraftmfg.com/Standar..._5th_wheel.htm
You will notice that Space Craft uses that cheap fiberglass batt insulation also, along with polystyrene.
Not knocking your choice or the manufacturer, but I'm happy with our MS.
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Olympic Peninsula, WA
2008 3500HD LTZ CC 4X4 Duramax/Allison /Banks IQ / Economind tuner / SpeedBrake
2013 MS 38RESB3 #6393, modified with ES stuff & Garnet Paint
"The older I get, the better I was!"
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