I usually drag out the Hughes AutoFormer only after observing park voltage but that's more and more often these days. As noted in a Youtube video a voltmeter is an essential thing in a camper. Avoid the types with a mechanical needle -- been thru two which were both inaccurate (albeit adjustable) and which eventually shorted out.
-- Chuck
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2006 Roo 23SS behind a 2017 Ford Expedition
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