Not so sure. I have heard of people getting them at CSR. They have rooms with trundles at POR and I think you can get a roll away there also.
I had the same thing this past trip in October. Except we were at the YC and I have teenagers. Although the room slept 5, my son did not fit on the daybed and he wouldn't be comfortable sleeping with his sisters, so I brought a single aerobed. Took it as carryon luggage in a dufflebag. Got sheets and blanket from housekeeping. Just stood it in the corner during the day. No problem at all.