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Possible but not easy.
Roller doors are sprung internally, and as zero pointed out they need gravity to make them fall. If you did do this the things to overcome are water egress throught the guides and the door would have to be pulled down from the bottom of the roller door against a very large load from the internal spring. If you do not use the internal spring, they don't roll up.
The doors on the backs of trucks are roller shutters, which unlike roller doors are made of individual slats that are 50mm to 100mm and interlock. When these doors are mounted vertically they are water tight but when laid flat can leak. The polycarbonate doors have the same issues as the roller door with spring tension, but they are a hell of a lot dearer.
I quoted just this week to supply and fit a 1.1m by 1.2 polycarbonate door in a pub, it was just under 2k which is considered a good price. Aluminium shutters are the same price as the polycarbonate.
My 2c: I install garage/commercial doors for a living, so I know them back to front, but I would just make a sliding shutter. Its cheaper and easier.
Brett
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