 It talks about the various portable tire inflators that make this job much easier, some of which run off 12 volts and are very small. The downside is most of these tiny ones that are very portable don't really put out a lot of air and don't have long longevity. You can also bring an air tank of compressed air in your trunk. A five-gallon tank is only about $50, especially from Harbor Freight, about $30.