I always leave my inboard tank closed. When I run out the outer I turn to the inner and open it. This way I don't ever run completely out. I take the outer tank when convenient to fill. Every so often I will move the back tank to the front.
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2015 RAM LongHorn Dually Air ride Aisin 4:10's
2016 MS 39TKSB3 "Highly Elited"
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