Batteries, solar panels, chargers, lights, switches, wire, connectors, monitors, all that stuff!
I'm designing the trailer I'll be building soon, and I'm into the electrical part of things. So far, I'm set on a lithium battery, a single fixed 100watt solar panel (though I might add another or a suitcase in parallel), Victron solar charge controller, Victron shore power charger, and a Dometic 12v cooler.
Curious what everyone else has that they LOVE about their electrical setup, and also any elements that you'd change out if you could.