The engine isn't in the trailer. That is in the tractor, which pulls a trailer.
If OP meant "fueled by unrefined oil" then sure, but I didn't even consider that to be an option.
The heavier crude grades cannot be (realistically, at least) put into trailers or tanker cars - which is what I thought was being implied here for the Gulf oil sources.
Very old US light switches often had both AC and DC current ratings, and the DC rating was noticeably lower due to the arcing problem, even with fast-acting snap action.
My grandfather worked in a Chicago office building that had 110V DC service even into the 1960s. He had to be careful to buy fans, radios, etc. that could run on DC.
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