May have been there to prevent water intrusion, to prevent rodents/insects from entering, or who knows, maybe to add flotation to the van for those river crossings.
The risk of sealing that area with foam and/or 3M undercoating, is if water enters by some other path and then gets trapped in there without the ability to dry out.
Though call.
Herb
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SMB-less as of 02/04/2012. Our savings account is richer, but our adventures are poorer.
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