Painful memories of my euro fridge days coming back to haunt me here.I remember loading green grapes in south Italy in the nineties without realising the basic principles of refrigeration,no tuition beforehand 
in go the grapes to a cool temperature set by me in the trailer and 3 days later back in Oxfordshire the entire load had ripened,so no good for the shops as they’d just perish on shelf,so of course they’re rejected outright.(temperature needed a gradual adjustment) 
There’s a lot to know that never gets taught to a professional standard considering this is food.I wasn’t the only offender with ND Fridge either,lots of ‘miscalculations’ abounded including a rear door ice-cream deluge incident, for one unfortunate soul delivering in Portugal.There should be a qualification at some level for this work I always figured,obviously not ADR level grade but maybe a specialist component of the CPC farceathon.