What unusual cargo did Tesla use during the first public demonstration of its Semi truck's capabilities in 2017?

Tesla's entry into the commercial transportation sector marked a significant milestone in the electrification of heavy-duty vehicles. The Tesla Semi truck promised to disrupt the freight industry with impressive performance metrics and innovative features. This poll tests your knowledge about a unique aspect of the Tesla Semi's product launch that set it apart from conventional truck debuts and highlighted the company's marketing approach in the transportation industry.

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A full load of Tesla Powerwall batteries
Another Tesla Semi truck (truck-on-truck transport)
A cargo of Tesla Model 3 cars
Solar panels for Tesla's Gigafactory