I've always like the idea of a hitch mounted genset over a trailer. Seems like a reasonable expectation to find an efficient diesel genset that could output something like 12 kW. It wouldn't quite keep up with demand, but if you start with a full battery and supplement with a genset, you'd only slowly lose battery capacity, and would gain it back whenever stopping for a break. The idea would be to size the genset so that it gets you a full day of travel while utilizing most of the capacity of the battery. You'd size it for worst case scenario on a cold winter day, so that in summer months the genset would actually keep up with demand. Perhaps a 15kW genset would be more appropriate.
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