We like the "rear lounge" floorplan. They usually have a big window on the back of the trailer, and windows by the sofa and dinette. It just makes everything feel "open". Most manufacturers seem to make a variation.
We looked at a bunch of them, and almost bought this one:
The problem is, when you are sitting in the rear chairs, the sink/island portion of the kitchen cuts you off from the rest of the trailer. And, the entertainment center isn't in a good location. The TV would be obstructed by the island, and the TV is the wrong angle from the sofa.
The design we got instead has the entertainment center in front of the sofa and chairs. Also, it's just a more "open" feel if you have a bunch of people visiting in the trailer.