Ok, this wasn’t on our original priority list, but is one we recommend you consider. Campervans use a secondary battery to keep the refrigerator and overhead lights working while the vehicle is switched off. Every few days the battery must then be recharged. This typically requires staying at a holiday park, which costs a premium and is not always near the activities you’re targeting. By renting a campervan with a solar panel, we were able to trickle charge the second battery without needing to plug in, enabling us to be off-grid the entire trip and closer to nature attractions (the main reason we were visiting).