Did you look at the 2251SLE? It has the bed on a slide out AND a slightly larger dinette. Plus, I think the bench style dinettes are more comfortable than the U-shaped dinettes if you're trying to seat more then 2 people. The U-shape units seem to be short on leg/feet room underneath.
BUT...the holding tanks are a bit smaller on the 2251.
I guess it depends how you're going to use the rig?
Or, go a bit over 4' longer to the 2551 and you have the best of both models, PLUS a couch AND the bathroom sink is in the same room as the commode, which was always important to us. And a little bit of actual counter space for food prep.
Good Luck in your search!
~Rick