Judi, I might add that if you are ordering the 2551 through the factory you might ask them to do a far better job on the bed frames. The frames are not well supported. And, a hatch to the pump will save unscrewing that huge plank and taking it off to get at the pump area. Plus, the bed slab is 2" shorter than the mattress on the aisle side! When we put new plywood (very much upgraded from what was there) down we extended it out two inches so the mattress wasn't hanging out there with no support. We love the twin beds but their original construction was very basic. Frankly, the measurements were off, the plywood was the lowest grade and the bed support on the passenger side was screwed into the very thin bathroom "wall."