I just went and looked. I have 12 Gallon. Have had no issues to date and when on 50 AMP power I only use electric. We basically shower back to back; maybe 10-20 minutes between showers. I would say we take average showers.
In my toy hauler we turn water on and off and take navy showers since we need to conserve water and not fill gray tanks. But in Montana its just like showering at home for us.
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2022 CC LB F350 SRW--Diesel; 50 Gallon Titan Aux Pack Tank; Airbags with onboard Air
2022 Montana 3231 CK (Lower 48 Winter Rig)
2007 28' Desert Fox Toy Hauler (Alaska Summer Rig)
