It was laziness.
I worked for tuffnells.
The trailer was on a slope I’m guessing he stooped a foot or two away from the trailer hooked up the air lines and took the trailer brake off and tried to guide the bar into the vgb coupling but it missed and crushed the driver between the primemover and the trailer.
Vgb coupling is a pain in the ■■■ unlike artic coupling as you have to be pretty much dead on so some people get out and manually guide it if the trailer is on a slope as gravity is working for them.
People still do this at tuffnells because it’s all rush rush and they don’t want to invest in a reversing camera so you can hook up easily.
Anyway, anyone who can reverse a tuffnells trailer deserves respect they are a proper pig to reverse.