I arranged to pick something up there for a bloke who worked in Holland in the week - his wife was with me and we took an old Mercedes estate that she never drove.
We managed to get the rather large item out into the car park, but there was no way that I could see to release the back seats, to create the necessary space for it.
Then it started snowing...
Eventually, in desperation, we looked in the glovebox and the owner's manual was actually in there, so we discovered the secret method, just in time - then headed off into the blizzard.
I would say that the staff in the shop were particularly helpful - providing a trolley to get it to the car, then being prepared to get it back inside, under cover, when the 'bottleneck' in the proceedings happened.