What is a bobtail tractor? Question What is a bobtail tractor? Answers A tractor without a trailer A tractor attached to two trailers A tractor with a tank Explanation Tractors without semi-trailers are referred to as bobtail tractors. Operating a bobtail tractor requires drivers to exercise caution. This questions appears in the following tests: Alaska Combination Connecticut Combination Idaho Combination Idaho Combination Iowa Combination Maine Combination Michigan Combination Missouri Combination Ohio Combination Oklahoma Tank Oklahoma Combination South Carolina Combination Utah Combination Washington Combination Wisconsin Double