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.
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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.