My Kodiak 240 KSSL has the front bunk design with a rear king slide and big u-dinette side slide. This give tons of room at the back. My only compliant is the front bunks are quite narrow, my one teenage son has out grown them and now sleeps on the pull out couch, but that OK, because we now have the top bunk as a clothing storage space.
This is a Keystone trailer, so if you are looking for something different, I believe Jayco makes the exact same floor-plan, but I like the Kodiak's interior better. We got the version with the wood plank flooring look, Jayco didn't have that.
Good luck.