Our rv camper has a queen, two bunks, and the sofa and table fold down as beds..I put Maky in bed with me(queen) and you should have no problem putting or finding something to keep little one from rolling out/off..even just a board of some kind. I use giant pillows to keep Maky in bed..the best thing about rv'ing is that you can feel and hear anyone moving about as they are only a few steps away. Have fun! I can't wait to get inside mine and get camping! xxx