Thanks for the reply @Shane826
We are still in route home, so don't have an answer for the "sawdust vs mulch" question on if the wood is rotten or not. I agree with the concerns over it being rusted, and the possibility that this is just lag bolts. I thought I had read that they got rid of the wood and moving towards aluminum spines and supports around 2010 (some time several years before 2014), so am surprised that it is a 2x4 frame. Do you know the steps/access points for being able to get in and reinforce this area (such as putting a metal bracket in place for nut/bolt interaction) and if rotten replacing the wood pieces?
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