It's here, it's real--the genset trailer for your Makita powered car...

Little Generator Trailer Lets Electric Cars Go the Distance
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The device isn’t meant to be used as an everyday back-up. It was designed to be available for rent, used only periodically for the occasional long(ish) road trip to see a friend or visit a town that’s just a little out of your EV’s range. It can extend the range of some electric cars by as much as 360 miles. Some might say that towing a gas-powered generator behind an electric vehicle is ludicrous, but if the solution is used irregularly and only when truly needed, it probably still impacts the environment much less than driving a gas-powered car every day.