120V charge isn't near enough to charge a car quickly enough to get them back on the road in a reasonable time. A battery or generator running at 480V would be necessary for a timely service. Here's a link AAA Introduces Mobile Charging Trucks for Drained EVs. And, just for the record - the article is from 2011, eleven years ago. The truck has(had) 240V and 500V charging. You can also just call AAA to recover some of the eleven years you've lost.