Hello, and
to the forums. Hope you enjoy the stay, and learn a lot, and can teach others what you already know. Sorry for your problems. As to what you are missing, the main breaker for 12 volts. Don't worry, not in the panel. Usually under the tongue, or just behind the front wall under the camper. Will have 2 large wires, on studs, and a very small reset button on one end. Since it appears you have a meter, take it under there with you, see if you have 12 volts on one lug, and 0 volts on the other. Then look for the reset button, and retest. Good Luck.
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LadyWindrider
2012 Ford F250 ext. Cab 4x4
2002 Jeep Wrangler Sahara
2008 Yamaha V-Star 650 Classic
2008 Work and Play 18LT