2019 3130re. Mine came with steel U frame mounted under the coroplast under the black and forward grey tank.
I'm planning on adding more across the entire bottom both to support the coroplast (sagging) and the freshwater tank.
I only travel with 1/3 freshwater and empty holding tanks if not boondocking.
Going boondocking I will fill up at the last overnight stop if I know I can't get water at or near my destination.
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