Thanks to all for all the help and suggestions. Sorry for the slow reply but we've been trying to move from FL to TX and fight all the rain, storms etc.
As Javi mentioned I think I will try to find some plugs with a thicker head or put a layer of epoxy in some new ones when I get home. I will also call Atwood as was suggested and see if they have any ideas.
We really appreciate all the help and assistance given on this site. Hopefully we'll make it back home without another plug episode and get this resolved.
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