We have the Keystone Montana 3750FL. While we haven't started fulltiming yet, we have gone on several short break in trips. Including over Thanksgiving with 5 adults, 1 5 month old, and two fur babies. Even with that many people, we weren't cramped for space. The wife and I can pass through the kitchen without touching. The amount of inside storage is huge. We love the full width bathroom. The second door into the bathroom acts like a mud room for our dogs. With our B&W hitch, it pulls like a dream. We ran the heater during Thanksgiving and it had no problem keeping up in 30ish degree weather. There's an accordion curtain for closing off the living room. With that and the fireplace, you'll sweat yourself out. If you have any particular questions, let me know.
