On the split coupling malarkey.
When i wnet through Asda induction around 2009 to get the green card (agency at the time), they had a system i hadn’t come across before, a two position sliding fith wheel operated from within the cab by a combination of switch presses ensuring it could only be triggered by deliberate action.
The idea being the unit started off with the fifth wheel fully back, you would connect up than fit the air lines but double check the trailer brake applied, then operate the fith wheel slider and reverse the unit back till it clicked into its running position, then complete your pick up.
Obviously dropping off you would reverse the operation.
Brilliant system.
Do they still use this method, or is it in use anywhere else, i’d personally never seen it before but then only once in a blue moon have i had anything to do with fridges except for long term at Kwik Save, but mostly KS had day cab tractors and shorter trailers (access at shops) so split coupling was seldom if ever needed.