Just FYI, we were there 2 weeks ago in a 1bdr and they sent us an actual real rollaway bed for an extra sleeping option when I asked. (we were only 3 people and not
DVC members, it was a cash booking.) I had 2 adult kids with me who preferred not to share a bed but were prepared to do so if there wasn't an option. The caveat here as always is that I am sure this is not guaranteed and may not always be available, etc.
Made a similar request at Saratoga Springs 2 years ago and they sent a blow up mattress that kept deflating through the night haha...so we were excited to see an actual bed arrive this time!