re: Tesla Semi could be ‘the biggest catalyst in trucking in decades’

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Also, the tops of trailers would make excellent place for solar panels to get some juice.

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Again, you're adding more weight. Just as batteries are heavy, covering the whole top of a trailer with solar panels would likewise add weight as well. Every pound of weight to the truck itself you add is one less pound of freight that truck can legally haul.

Plus there's the matter of only some loads are in nice enclosed trailers. You can really put solar panels on top of flat beds, lowboys, or bucket haulers.