Some of the convertible beds are cantilevered beds and are considered bunk sized (so shorter and narrower). Some are sofas that the back flips forward to make a nearly twin sized bed. Some are sleeper sofas where you remove the cushions the pull the bed out and unfold it (might be queen or double sized and a few twin sized). Then there are the newest types found at Riviera and SSR where the entire piece of furniture folds down over the sofa (which makes it unusable while the bed is set up) with a real mattress. These are similar to the ones in the Value Family suites, but those fold down over the table.