Our campervan trip becomes nearer, in early October. There is a series of short videos to explain our van to us. The vehicle should be an auto diesel Mercedes, the Britz Ventura. Sorry about the strong Kiwi (New Zealand) accent. They are all about 1 minute or less. Well, not the first, which is not so interesting. Although they are brief, I don't really expect you to watch all of them. No matter how much I googled, I could not find out these basics until I found the links on Britz website. Dealing with the water, sullage and lavatory somewhat concerns me.
That put paid to my plan to steal power from family and friends. Things have changed and we may only be with such for two nights. We could buy an adapter for $90 that smooth out the 10 amp household supply to the 15 amp caravan, but we deemed it not necessary.
As you may have noted, while we have to be plugged in to charge the batteries every couple of days, I expect this could extend to three days without being plugged in, and all that won't work from the batteries is microwave, air con and power points. We have a kettle that we can use for tea and coffee.