Job Description. Propane Bobtail Driver / Service and Install Technician. Bobtail Driver - (Requires TX Class A or B CDL with Hazmat and Tanker Endorsements prior to hiring. Also requires Bobtail Certification from TX. Railroad Commission, but this may be obtained shortly after hiring.) Duties include. Conduct truck inspections with proper documentation. Fill propane cylinders at filling station. Deliver and dispense propane. Conduct leak tests. ...