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Where would those motors get their power? A big battery. That all costs money. Most travel trailers don't get used much, so there's all that money spent on electrifying to save money on fuel just sitting there (not saving money). That's assuming it would actually save much on fuel/energy costs, the biggest gain would probably just be increased power. Most people just buy a diesel if they want more power, which generally means better mileage, too.
If you were going to spend money making a hybrid (because that's essentially what you're doing), it would make more sense doing it to the tow vehicle.
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