The house battery on all of the Roadtrek Promaster models is under the vehicle in a box towards the rear. Take a look under there and you can't miss it. Your problem will be dropping it for changing.
If you are a Facebook user, I suggest that you join the Roadtrek Zion and Simplicity group.
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2021 Promaster 1500 118wb conversion
2019 Roadtrek Simplicity SRT (almost a Zion)
2015 Roadtrek 170
2011 LTV Libero
2004 GWV Classic Supreme
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