I've got a 2016 and since we rarely boondock, the single battery hasn't been a big deal. But -- I've been noodling on adding batteries for years. One member used steel to reinforce a cubby next to the tray and moved his batteries in there.
I'm down to two ideas in my head: (a) pay the $$$ to upgrade everything to Lithium and move them under the bed or (b) fashion up some steel brackets, attach and hang them from the frame rail. Stuff 'em in battery boxes, etc.
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2016 Greyhawk 31FK
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