Here's an idea: Virtually every RV park in the US now has 50 amp, 240 volt service to (at least SOME) of their sites. It might be a way to do a "fill up" for the cost of an overnight stay. An adapter shouldn't be too big a deal.
Replay available now: A handful of emerging network technologies are competing to be the preferred wide-area connection for the Internet of Things. All claim lower costs and power use than cellular but none have wide deployment yet. Listen in as proponents of leading contenders make their case to be the metro or national IoT network of the future. Rick Merritt, EE Times Silicon Valley Bureau Chief, moderators this discussion. Join in and ask his guests questions.