Don't know which charger/inverter you have but some have breakers on side of the case. Do you have the 110 volt panel circuit breakers for the inverter/charger turned on?
Also, if you were driving just prior to connecting to the campground power you may have a faulty boost solenoid circuit. You should be charging the house batteries while driving and the voltage you report is way to low for having just stopped driving.
It helps when posting to list your coach model and year and your run number.
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Pete - Full Timing
2000 Country Coach Magna 40' Indulgence, CAT C10, #5892
2019 Ford Ranger XLT
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