Simplify question--what powers the battery combiner solenoid when engine is running on a sprinter?

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AS a Canadian I'm sure happy I still have a house. Parked my RV for the season yesterday. Returning from Edmonton. Camped at Glowing Embers.
While there saw a good number of people buliding skirting, insulating slide out's. One-fifth wheeler. Had almost all his unit covered with silver backed commercial insulating. With the Canada / United States border closed. All of the southern BC. spots taken. People are simply hunkering down where ever they find a year-round camp ground. I think...

I got the bond for my bonded title issued by State Farm. Now I will send it to the state with my title application.

Today I got the fittings I needed to hook up the propane tank and block off the line where the stove used to be. I decided I want the space where the stove and oven was. I might get a small microwave and put it somewhere in the camper.

I tested the heater after that. It is a Duo Therm model 65210-4, 6300 BTU heater. It is a very simple heater that...

I purchased a 2017 22r Minnie Winnie and wanted to have a spare tire. One did not come with the RV.
I replaced the tires and Purchased a rim that would supposedly fit on my ford chassis. Well of course I had a flat and the spare would not fit. I called all over trying to find the right rim. I even called a ford dealer to see how much a spare rim would cost. They asked for my vin # and told me it would cost $450.00. So was wondering what other people have done for a spare rim?