The usual configuration is two singles which can be pushed together to make a queen and a convertible sofa. Roll-aways may be provided too, which sounds like something you need. I would get with my agent and verify the sleeping layout for your cabin, and if a rollaway was requested with the booking. Which cabin number is yours? You can see how the room is configured by going to the Carnival Victory Deck Plans Page
, finding your cabin and then looking at the legend for cabin layouts.