I was astounded when I realized our houseboat and ROO didn't come with a 12v outlet. It was one of the first mods I made. With that and 150 watt solar panel, and 2 batteries, you can charge anything. On our houseboat, I installed one of these for multiple charge capability.
https://www.ebay.com/itm/12V-Car-Cig...jm4-PZSg-1Y8Sw
That said, the battery pack charger/compressor is something I carry on every trip. It jumps a car or truck faster than jumper cables, and will top off a tire to get you to the nearest tire shop, or fill your spare up to spec. after a flat. Like most small, cheap compressors, it won't pump a flat tire to 80 psi without overheating and burning up. It helps to have it plugged in with the engine running while using the compressor. On a hot day, they'll burn out in about 5 minutes of high pressure work.