When backing a trailer, unlike backing a car, straight truck, or bus, which way do you first turn the steering wheel to make the trailer go left?

AAMVA CDL Manual, Section 6.1.7 "Backing with a Trailer," p. 6-3

Backing a trailer the 'car way' sends it the wrong direction and can jackknife the rig in a tight yard or dock within seconds. This reversed-steering habit is one of the first physical skills a new CDL driver has to unlearn from car driving.