'Strapping' will also 'sag' with the under belly (and pocket water)... you will have to install some type of bar or angle iron for support.
The 'designers' should have known that 'under bellies' like this would not be 'tight' enough to keep out water and other infiltration. If what you have is 'blown' in insulation, you will have problems with it now and down the road.
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Brother Les
2013 Forest River Salem Hemisphere SBT312QBUD
2001 CrewCab F-250 7.3 PowerStroke Diesel
SuperChip, BTS transmission, 6.0 Trans Cooler
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