we tend to struggle with temp on fridge tauts,there o.k if you leave fridge running,and dont open curtains or leave on bay with doors open for too long.
but if we have too we obviously drop them too min temp[+2 ] theyll go down to ,but still struggle to pull temp down, there now saying dont set them to +2 , set them to +3 and that should sort temp problems out.
cant see it myself , but does anyone whos used one have a idea why it would 
n.b tried it today and didnt seem to make a blind bit of difference 
The sheer temps in a trailer atm is hot as, so cooling one espcially when it isnt sealed is going to be hard, setting it to +3 isnt going to keep it cooler than +2 (logic)