When parking a doubles combination overnight, what is the proper procedure?
a.Park on a slight incline and set only the tractor brakes
b.Park on level ground, set parking brakes on all units, and chock the wheels if necessary
c.Disconnect the trailers and park them separately
d.Leave the engine running with the brakes set
Explanation
When parking doubles or triples, park on level ground, set the parking brakes on all units including the tractor, trailers, and dolly. Use wheel chocks when necessary, especially on any grade. Ensure the combination is secured against rolling.