A bobtail is a trucking parlance for a truck without a trailer. Meanwhile, truckers refer to semi-trailers (or semis) as trucks with one or multiple trailers to haul cargo. It means the difference between a bobtail and a semi is the absence of a trailer. It’s commonly termed a ‘cargo-free’ truck. The term ‘bobtailing’ differs slightly from what truckers call ‘deadheading.’ Bobtailing is driving a freight truck without a trailer. On the other hand, deadheading means driving a truck
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