Typical duties include but are not limited to: Responsible for the vehicle and trailer electronic communication systems, which consist of multiple Radio Frequency systems that include High Frequency (HF), Very High Frequency (VHF), and Ultra High Frequency (UHF). Operation of tractors and semi-trailers, tractors and full trailers, trucks with dolly converters, Safeguards Transporter Trailers, and Armored Tractors.