As the other commenter said, there are very low wattage AC units that work fine for very small spaces. I saw a guy on YT convert a tiny window unit into a mini

As the other commenter said, there are very low wattage AC units that work fine for very small spaces. I saw a guy on YT convert a tiny window unit into a mini split and that thing only used 800 watts I think. Which is only one or two solar panels you can fit on a van roof easily. He had to drain the refrigerant and resolder the copper tubing to place the radiator directly below the van, but it honestly didn’t look that difficult. Most challenging part is having someone drain the refrigerant who’s certified to do so