We put a Disco-O-Bed XL cot across the dinette of our 2014 21C and it fits perfectly. We've used it a couple of times now and it's a great solution for anyone wanting to add more sleeping space to a 21C. The side also pops up pretty easily and allows us to still use the table while keeping the cot set up. We have 3 kids using this arrangement. I saw a different post about trimming it down for a 19, but it fits without modification in the 21.