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This is not quite correct. The factory uses a 2 component expanding foam to seal the side of the floor to the cab corner in every truck I have cut apart.... which has been lots I can tell you. It is not a hard foam like used to seal around windows and doors in a home, rather it's a soft foam.
New rockers cab corners and bed liner and I'm getting that foam out if I can to make sure it won't rust as soon
True for it being there for a reason but the bed liner will at least slow the rust from starting again