Dropping or picking up a trailer find your own routine of doing this BLACK helps but also remember the number plate some many don’t as you see them at some RDC etc so don’t worry
If someone does tries to distract you ask them to wait a minute then start from beginning with routine
Last week I was dropping a trailer went through my routine another of our drivers came to “help” I got in cab checked my mirrors only to find him winding the legs up jumped out shouted no at him then went to explain I was dropping it he did apologise as he thought I was picking it up no damage but good job I did check so if in doubt double check everything