I realize you feel mislead by brochure advertising, but I'd guess the FW tank is a standard size (same) though out most all Montana models. Many of us live with what we have and others use a bladder to add to the OEM capacity. Other than vent ... you won't change much other than kick dust. Depending on how you are setup at another campsite, you may get another 4 gallons from the 6 you currently discount as unusable.
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