It would depend on how your Winnebago is wired. Lots of motorhomes isolate the chassis battery from the house batteries when the rig is parked. I think the idea behind this is that if you use up all of the power in the house batteries, you will not be stranded because you still have a fully charged chassis battery to get you going. I have a 2004 Allegro, and have wired in a small battery maintainer (trickle charger) to maintain the chassis battery when it is parked for long periods of time. The house batteries charge off of the converters built in charger while the coach is plugged in to shore power. You can check with a voltmeter to see if your chassis battery is receiving charging voltage from your converter, by reading the voltage across the battery's terminals while plugged in to shore power.