Curiously enough, we had the exact same question a few days ago. We were concerned the day bed woudn't be a good option for our toddler.
Getting info on rollaway cots wasn't easy. We called CRO, and they tried diligently to get the info but couldn't confirm 100% rollaways were available.
We called the CR direct -- Housekeeping Manager (get the facts direct from the folks who make the decisions is always best) and found that rollaways ARE available at CR. However, due to space limitations they will only bring a rollaway to rooms with King beds (the Housekeeping Manager advised us that fire regulations won't allow rollaways in rooms with 2 double beds). They also told us the rollaways weren't the most comfortable.
My advice to you is to request a room with 2 double beds (which is the most common option anyway). This will give you sleeping arrangements for 5 (2 people in each double bed, and 1 person in the Day Bed).