Originally Posted by Jeff zone 8 N.C.

You should give it a try but be aware that it may not work the way you expect. Banana plants strongly seek for the trunk to be somewhat vertical looking up (at the sun I suppose). If you roll them over on their side for winter the trunk will begin to turn upwards very quickly. This will begin to happen within hours but in 1 to 2 days the trunk will be reaching for the sky so much that, in a conventional nursery pot, it will not be able to be turned back to its original upward angle as the trunk will now topple that pot over with it's weight. Yes the barrel can be rolled to correct this but the trunk will never recover back the other way. The trunk will not turn up with a long curve (like a coconut palm) instead the whole trunk will stay fairly straight but will angle near the soil line leaving the top part of the trunk above the base somewhat straight. I have had potted bananas be blown over in hurricanes and if not set back up within a day they begin the angle and if left for another day they have to be repotted to correct the trunk.
Yes you may be able to put the plant into the dark or dormancy to stop that. I have never tried. Or you might be ok with the barrel opening being not on the top after the winter. Also I do not know for sure if the trunk seeks light or if gravity tells it to stand upright.