To apply, you must: Be at least 21 years old, Have a High School diploma or General Education Degree (GED), Have a Commercial Driver’s License (CDL) ‘A’ & ‘B’, with Haz-Mat and Tanker Endorsement, Have at least one-year CDL driving experience, Have a clean MVR with less than 3 moving violations over three-year period, Be able to pass DOT physical & DOT drug screen, and. Couple and uncouple trailers by changing trailer jack positions, connecting or disconnecting air and electrical lines, and manipulating fifth-wheel locks.